Can Any Do This For ME

I Want A Datapack/mod Where Only Single Block At 0, 0,0 Axis WIth Only 1 Bedrock For Minecraft 1.20.1 java Edition And Fabric In All Dimension Like Neither And End As I Said Where Only Single Block Of Bedrock At 0, 0, 0 Axis WIth Only Bedrock Also Player Spawn On The Block - Preserved biomes, meaning grass colour and mob spawns will change per biome as they would normally - Preserved bounding boxes for structures, meaning things like Witch Huts and Nether Fortresses will spawn the specific mobs that normally exclusively spawn there like Witches and Wither Skeletons if the players place spawnable blocks there - I need this to run on a server that already has multiple worlds running and this datapack cannot interfere with the world generation on the other worlds