Good silicone potting material costs hundreds of dollars at a minimum, so it isn't really feasible to re-pot lights unless you're producing a lot of them. The bottom of the board is still fully encased after my mods because everything slips right back into the form snugly and is screwed in place. It is probably technically possible to cut around the edges of the top of the board and leave most of the thin film of potting material deposited there in place, but it wouldn't be doing much of anything.
In general, most Zebralight models released since about 2012 have limited emitter swap options because of the integrated driver. XM-L2 must be replaced with XM-L2 (but not EasyWhite because it's 6V), XHP50 with XHP50, etc. You could substitute a different tint, or in the case of XHP35 a nice 4500K HI or couple of slightly exotic options like 90+ 3000K HI or 90+ 5700K HD. The only recent lights Zebralight has produced with standard XP pads are the current XP-L2 models and a couple of red XP-E headlamps. The XP-L2 models only exist because Zebralight's 2-step tint binning requirement meant it was literally the only LED they could use. For any of these models you can use XP-L, 219B, 219C, SST-20, LH351B through D, and so on. The SC64c is the only 18650 model, so you can probably see why it's always been of such interest as a potential modding host.
