These aren't zaps, but you might want to check out LN prisms which use lightning addresses and takes into consideration split fees on LNBits. The extension was just updated today by @dni. I think splits can work if the amounts are above a certain threshold that allows for fees and routing but splits are most efficient if its all one LNBits instance.

Zaps will probably be enabled ln LNBits soon and could possibly be combined with the existing Nostr stuff in LNbits as well.

Step by Step Guide on how to make your own Lightning Prism

bitkarrot.substack.com/p/lightning-prisms-with-lnbits

and the Why by @dergigi

dergigi.com/2023/03/12/lightning-prisms