How much power do you want?
You should be able to squeeze one of these drivers in there, but you’d have to abandon the 7135’s on the bottom: 22mm 16x 7135 driver for F13 flashlights
It’s not really clear how much space is available in that pill for stacking either.
For DD you could look at the BLF22DD. Again I see no reason that couldn’t be shaved down to 21.5mm.