Doesn't that require private keys? If so, it's a bit out if scope since I don't want that headache. If not, it would depend on BDK supporting that kind of wallet descriptor.

I'm not certain if a private key is required. From my understanding, it uses a form of DH key exchange, which allows users to generate an address for payment. The receiver then actively monitors the chain to detect incoming payments intended for them. This is why I drew a connection between your development and sp