I'm surprised no one has asked about forestry compatibility. While that would probably be too difficult, I think the better option would be to give bees a % to change the block they interact with to another block of our choice via-crafttweaker.

With this we (the players) could manually build some sort of compatibility with not just forestry, but with many other mods.

Not going to happen. That's not how 1.15 bees work, and I don't feel like it's worth the effort to replace the bee entities in Forestry.