So I’m down past the heel/gusset/flap/bendy bit of the sock, and it totally worked. It fits. I’m not quite sure if I’m in love with it. I need to work a few more rounds and try it on before I can be sure.
I like that it let me avoid the dramatic flashing this yarn seemed likely to do. I love that it let me work back and forth all the way from the heel turn to the end of the gusset (wooly nylon held along, worked perfectly). The only thing I’m not crazy about is the expanse of purls. I used purls because I thought they would give that sort of horizontal visual line you usually get in the gusset. I may try it again in the future with a different stitch pattern.
The current verdict is promising, but with potential for further improvement in the future.