Well, an update from me, since it has been long enough.
Decided to give a spin of LineageOS, since there are no new Resurrection Remix ROMs anymore, and Lineage seems to be the only one still getting updates at this time. Mercifully, I was able to continue using TWRP; and its update script is even compatible with that recovery too.
I do miss some of the tinkering levels of customization, but it really is about as simple as an Android ROM gets. Reminds me of the old days of AOKP on the S 3. Battery usage from system is also measurably better; at least, GSam reports an average of an extra hour of screen on time since the ROM switch.