The processing equipment is what is hard for motion picture lengths.
In this design the non-emulsion side is completely against another surface, remjet doesnt come off in developer, so you can develop, stop, then remove by hand in light, or even do it after fix. Which is what I did with my first roll.
When processing 35mm ECN-2 in a hand tank, I use a little hydroxide in ~40c water, with lots of agitation, then a fresh lot of it a second time, then plain water a third and fourth time, lots of agitation in all removes 98%+ of it, should be pH neutral then too,any left over traces dont come off in developer and can be wiped off by hand after.
Honestly, its not much of a problem