Do a search for "Catana mainsheet" or "Leneman delta
V" this is old news on multihulls.
I have a Catana
. One trims the windward side for angle of attack (like a traveler), and the lee side for camber. It is simpler than the traveler, but you do lose some fine trim especially on downwind. Another plus is that the sheet effectively acts as a boom brake/preventer