Anybody Modded a Fenix E15 or Keychain twistie cr123?

These days with IMR 16340’s able to handle 5~10A of current I am wondering why I don’t see many keychain CR123 based twisties.

IMR 16340’s = awesome at high current
twisties = small design and no clickies to melt
keychain = can actually carry everywhere
18~20mm diameters so maybe even a Triple XPL dedomed with carlo optics

I have a Fenix E15 and at very least hope to have it XPL dedomed with stock Optic and DD off IMR 16340. 1000 lumen keychain twisty coming up.