The problem

Completely replacing the bedrock layer will probably lead to incompatability with BedrockOres, which generates factorio-esque deposits of ore on the bedrock layer

My solution

Allow for more nuanced bedrock replacement, IE instead of removing it entirely only make "holes" in the bedrock that the player can travel through too other dimensions

Why the existing features won't cut it

As far as i can tell both methods of disabling bedrock, wether through completely deactivating it or replacing it are global, and have no support for having only partial replacement of the bedrock layer

Additional context
ill have too check in bedrock ores config if they dont have a workaround on their end, but i dont think they would.

I think you could keep bedrock enabled for the dimension and instead use custom ore generation of very large stone "ore"-veins at y = 0...5 that replace bedrock blocks:

INIT() {
    add("oregen", 0, "minecraft:bedrock",  1.25,  50, "minecraft:stone",  "center", [1, 2, 5]#);
    ...
}

The arguments for the config command are as follows:

• "oregen": we want to add ore generation
• 0 is the dimension ID for Overworld
• "minecraft:bedrock": the block to generate in
• 1.25 is the average number of veins per chunk and controls how frequently there will be holes in bedrock layer.
• 50 is number of blocks per vein, and controls the size of the holes. (50 is the default size for vanilla underground dirt blobs)
• "minecraft:stone": the block to generate as ore vein
• "center": height distribution mode
• [1, 2, 5]#: min, center and max heights