Bedrock shipwreck and ruined portal (for speedruns)
This list on Java: Shipwreck and ruined portal (for speedruns)
Bedrock Edition 26.50 - 26.52. Checked with Seeder's engine on .
The shipwreck start, on Bedrock. Wrecks follow their own rules here (Bedrock even changed how it spreads them in 1.18), so a Java shipwreck seed won't help you. On every seed below a shipwreck and a ruined portal are a short trip from spawn. Loot the wreck, dig up the treasure and you're ready for the Nether.
The shipwreck start. Find the map that will lead you to a buried treasure with iron and a heart of the sea. Now with a ruined portal included in the price.

1 From spawn: a shipwreck 91 blocks west and a ruined portal 82 blocks south-east.
Seed1220802856087292
What X, Z Distance Shipwreck -72, 24 91 blocks Ruined Portal 56, 72 82 blocks Trail Ruin 40, -184 186 blocks Trial Chamber 120, -200 225 blocks Village 152, -248 283 blocks Abandoned Camp -136, 280 319 blocks Igloo 24, -328 328 blocks StrongholdApprox. -414, 770 882 blocks Estimated spawn in a windswept forest at 16, 0, around Y 68. Approximate spawn

2 From spawn: a shipwreck 57 blocks south and a ruined portal 91 blocks west.
Seed977013834621458
What X, Z Distance Shipwreck 88, 120 57 blocks Ruined Portal 8, 40 91 blocks Trial Chamber 344, 120 254 blocks Village 264, -248 354 blocks Abandoned Camp 424, 216 362 blocks Igloo 328, -232 376 blocks StrongholdApprox. 722, -334 742 blocks Estimated spawn in a snowy taiga at 96, 64, around Y 66. Approximate spawn

3 From spawn: a shipwreck 136 blocks north-east and a ruined portal 61 blocks south-east.
Seed995761043997515
What X, Z Distance Shipwreck 88, -72 136 blocks Ruined Portal 40, 40 61 blocks Abandoned Camp 168, 24 184 blocks Trial Chamber 152, 216 261 blocks Igloo 232, 136 276 blocks Village -312, 232 366 blocks StrongholdApprox. 178, -798 837 blocks Estimated spawn in a snowy beach at -16, 16, around Y 63. Approximate spawn
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4 From spawn: a shipwreck 149 blocks south-east and a ruined portal 79 blocks south-east.
Seed4533973162155335
What X, Z Distance Shipwreck 88, 120 149 blocks Ruined Portal 56, 56 79 blocks Trial Chamber 56, 296 301 blocks Ancient City -216, -248 329 blocks Village -328, 184 376 blocks Abandoned Camp -344, -184 390 blocks StrongholdApprox. 866, -238 898 blocks Estimated spawn in a desert at 0, 0, around Y 74. Approximate spawn

5 From spawn: a shipwreck 88 blocks north and a ruined portal 88 blocks north.
Seed1082896946764323
What X, Z Distance Shipwreck 8, 56 88 blocks Ruined Portal 8, 56 88 blocks Village 152, 104 142 blocks Trial Chamber -216, 232 248 blocks StrongholdApprox. 738, -974 1.3k blocks Estimated spawn in a forest at 16, 144, around Y 67. Approximate spawn

6 From spawn: a shipwreck 69 blocks south-west and a ruined portal 126 blocks west.
Seed414063881200145
What X, Z Distance Shipwreck 120, 8 69 blocks Ruined Portal 56, 8 126 blocks Trial Chamber 88, 88 149 blocks Monument 104, -328 305 blocks StrongholdApprox. 706, 770 961 blocks Estimated spawn in a jungle at 176, -32, around Y 78. Approximate spawn

7 From spawn: a shipwreck 120 blocks south and a ruined portal 114 blocks south-east.
Seed5241123102710509
What X, Z Distance Shipwreck 8, 120 120 blocks Ruined Portal 72, 88 114 blocks Trial Chamber 24, 248 249 blocks Abandoned Camp -280, -136 311 blocks Outpost 392, 56 396 blocks StrongholdApprox. 194, 834 856 blocks Estimated spawn in an old growth birch forest at 0, 0, around Y 84. Approximate spawn
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8 From spawn: a shipwreck 57 blocks north and a ruined portal 82 blocks north-east.
Seed2448406442251098
What X, Z Distance Shipwreck 8, 104 57 blocks Ruined Portal 56, 88 82 blocks Trial Chamber 40, 152 25 blocks Abandoned Camp -296, 168 312 blocks Ancient City -152, 456 340 blocks Stronghold -1518, 850 1.7k blocks Estimated spawn in a stony shore at 16, 160, around Y 67. Approximate spawn

9 From spawn: a shipwreck 76 blocks east and a ruined portal 162 blocks south-east.
Seed2131934266655761
What X, Z Distance Shipwreck 40, 24 76 blocks Ruined Portal 56, 136 162 blocks Swamp Hut -248, 104 240 blocks Trial Chamber -344, 40 315 blocks Abandoned Camp -248, -232 317 blocks Trail Ruin 40, 376 383 blocks StrongholdApprox. -894, 738 1.1k blocks Estimated spawn in an old growth pine taiga at -32, 0, around Y 77. Approximate spawn

10 From spawn: a shipwreck 147 blocks south-west and a ruined portal 47 blocks south-east.
Seed1051095788243632
What X, Z Distance Shipwreck -104, 72 147 blocks Ruined Portal 24, 8 47 blocks Trial Chamber 40, -264 235 blocks Monument 312, 184 379 blocks StrongholdApprox. -526, 818 1k blocks Estimated spawn in a flower forest at 0, -32, around Y 67. Approximate spawn
Need more?
These ten seeds are the best out of thousands I searched. Seeder can find as many as you like, given the right premises, with your own range and in your favourite version.
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Do these seeds work on Java?
No, the wrecks move: Java places shipwrecks and ruined portals with its own rules, so on Java you'd get the same coast with nothing on it. The Java list of shipwreck and ruined portal seeds has Java's own picks. The treasure map trick works the same on both editions, though.
More about Bedrock seeds: Bedrock Edition