Nuh on Nostr: Lazy question (promise to read more later); is there any way for a non custodial ...

Lazy question (promise to read more later); is there any way for a non custodial server to deal with the "remixing" of vtxos on my behalf?

Asking because if that is at all possible, I would like to add that as a native function or a plugin to the same Homeservers hosting users private data and republishing their Pkarr keys to the DHT.

Or in Nostr terms, user's paid relay.