I looked quickly at MtnE and he's got a 22mm and 26mm driver supporting LDO. Unfortunately both are just a FET, not FET+1. Still, do-able but have to add a "FET only" option to Narsil, and generate a new ramping table, etc. Not sure if wight or others have anything up on OSHPark. You really don't need a FET+1 on a light like this I'm thinking. Can't imagine running it often for long times on lower modes, where the 7135 really helps.