making a small UV-zoomie with the new Ledengin LZ1 360-370nm led

I think you are thinking perfectly right, I think this emitter is great for the Solarforce convex lens, which is made of glass (I used it in a zoomie right because of the 70deg emission angle). I have not tested the emitter for maximum output before doing the mod, so perhaps 700mA is on the low side and you can get much more out of it. Mind that you run it at only 3W, P60 drop-ins can normally handle a bit more.