There will likely be a list of BT adapters, but that isn't available yet.
Because there's already a workaround for link keys, I'm relunctant to add yet another workaround as it would further complicate the implementation and it may not even be enough to get such adapters working :/
Games expect the adapter to work in a certain way (in this case: link keys being really written on the adapter) and the alternative workaround would have to change a lot of other things. It's simply not worth it imo.
(Also, the problems that Windows and Dolphin face are different. Windows can do "everything" it wants, since Dolphin (and therefore the game) never sees the details; but in passthrough, basically everything Dolphin does is seen by the game.)
Because there's already a workaround for link keys, I'm relunctant to add yet another workaround as it would further complicate the implementation and it may not even be enough to get such adapters working :/
Games expect the adapter to work in a certain way (in this case: link keys being really written on the adapter) and the alternative workaround would have to change a lot of other things. It's simply not worth it imo.
(Also, the problems that Windows and Dolphin face are different. Windows can do "everything" it wants, since Dolphin (and therefore the game) never sees the details; but in passthrough, basically everything Dolphin does is seen by the game.)