I swapped the emitter to Olight Warrior Mini. This same destructive method should work for S2R-II too.
As a first step I used a lathe to cut away the surrounding aluminum from around the blue bezel ring.
This resulted in a Warrior Mini with a chamfered head.
This made it possible to insert a thin knife blade into the gap between the bezel ring and the flashlight body, and use a hammer to drive the blade into the gap. First using a thinner blade, then a wider blade, hammering from different sides, slowly the bezel ring started to come off. The chamfer may also help the flashlight to slide more easily into my pocket. I also used the lathe to remove the pointy tactical strike bezel things on the bezel ring to make it smooth.
In the picture you see the original SST-40 inside. I changed it to this LH351D on another 3535 sized MCPCB. It made the hotspot wider, reduced throw, decreased lumens, increased CRI, and lowered CCT. The tint is nice on Turbo mode, but on lower modes my LH351D makes the hotspot slightly greenish tinted. I may try slicing the LED dome in the future to improve the tint (and throw as well). When I sliced the LH351D on my S1R-II, it made the hotspot less greenish than unsliced. Also after slicing the hotspot became smaller than with the original XM-L2.