You should be able to update the track now with artist name if you haven't already. This will set the track to show the artist.
It is better if you also have their npub, or ask them to create one, as that will make it easier for fetching their lightning address. I tried using a lightning address without npub but it is not very backwards compatible when you go back to edit the track. Plugging their npub ensures they get paid out to the address on their profile.
Zap splits should also work. For now they generate multiple QRs, but if NWC is connected, it's automatically paid out to multiple recipients.
I can look into keysend, but that sort of breaks the ability to verify payments in other clients. NWC is definitely a cleaner implementation.