If you want to do sovereign zapping, at this time Id recommend either self hosted Alby Hub or LNbits with nwc support. Afaik, there are no other robust solutions that can handle it. Glad to be proven wrong... cashapp, fountain, strike, primal, wallet of satoshi, zebedee - all custodial, and none of these offer nwc. coinos, minibits - custodial, and limited support for nwc. We gotta stop swimming against the current.