I just saw a vid on a baseline anchor by Tanglerwr. He uses an simple slip knot wrapped in a half hitch as a jamming safety knot that can't be pulled out accidentally.
I tried it and it's an excellent replacemnt for the doubled scaffold hitch, which took me a day-and-a-half to tie in my video. Way faster, delivers the same function, jamming against the large rings. Then I just shortened the prussik side of the OP loop and let the rings safety the 8-coil.