Thanks for the kind words!
The client app basically uses node just to sign transactions and extract hints from proofs. So looking at the dApp eip I suppose the initial version won’t support signing transactions with external hints or extracting hints from proofs. But down the road with adding these two features it will be very much possible and easy to use Yoroi for collective signing.
However, currently the client app is designed to support external secret. So if one wishes to use any wallet other than node’s and use ZK Treasury to sign collectively, she can do so by providing external secret to the client.