I think the way mutiny does it is pretty light.  They have a rapid gossip sync service for users and apparently even do a little probing to clean it up.  That means that the full Lightning client on the wallet side can be pretty light weight (no need to listen to gossip or check onchain etc.) with minimal trust assumptions.

nostr:npub1mutnyacc9uc4t5mmxvpprwsauj5p2qxq95v4a9j0jxl8wnkfvuyque23vg  thoughts?