infinity, if willing to swap the L2 stock driver you have other options. User ecotack reported here the L2 driver bay to measure ∅21.4 mm, this means you could stick one of these affordable drivers:
They're designed to run with up to 3S cells. The Manta Ray driver has a better mode range, and definitively looks to be a pretty easy filing job for it to fit in ∅21.4 mm.
You'll also get some extra lumens over the stock driver with them.