BYG adds a plant very similar to sweet berries, called Blueberries. It would be cool if those could be supported by this mod, so they aren't planted while being eaten.

They are unwilling to do so, can you please reconsider? Potion-Studios/BYG#420

Sorry, we will not be.
We don't want to fall into a loophole of adding support for every mod that adds a new type of berry.
Plus we'd have to do a bunch of forge registries checks and stuff when they could have a simple even that just checks if berry good is loaded, and in addition they would make the texture so that it matches their mods art style.

That would be preferably done on their end since it is adding a whole new item

For future cases, I'd like to suggest that you please reach out to any mod developers directly whose mods include berries that should be supported by your mod.
As a player, jumping back and forth between issue reports that have been closed because neither side wants to do it is not a good way to handle cross-compatibility... it looks like BYG will be adding their own version of pips independently from Berry Good.