I like the idea with 2x14500. I dont see putting regular triple or quad optics inside ET1 reasonable. Maybe you would like to use stock reflector with 4 small nichia leds? New VirEnce MCPCB for E17/E21/119/144/233U
I always add extra ring to hold o-ring if in stock configuration o-ring was placed between reflector and glass lens. And this is preferable way for optics, it removes pressure force from optics and legs stay straight neverless you screw down bezel with big force.
Dont have ready solution in stock, can make one if needed.