Chick is out presently - I'd pulled some shell away late last night and put him back in the incubator so that blood vessels and such would start to dry up and to give him a chance to absorb any yolk that may have been left. Worked some this a.m. on pulling away at the membrane and then put him back in the incubator. I did this a few times, about every 2 hours. Most recently popped him back in and went outside to work on their new coop and came inside to him out of the egg. A small amount of blood, but not bleeding now and what looks like some dried yolk stuck in the shell. Watching now and hoping for the best.
The membrane was in pretty rough shape - assuming from the early pip and then the long wait. His position was also terribly contorted - I'd assumed he repositioned and had pipped into the air cell (photo above) but once I got it open, his head was in a weird position down where he pipped - maybe a wing or foot that was in the air cell - stretching it? There was no tear or pip in that portion of the membrane when I examined. I actually 'went in' in that area because I was sure he'd pipped internally, but it took a while to find his head and beak (still down by the pip)
No idea if he'll make it a few hours, a few days, or a few years - but he has a puncher's chance at life now at least and I'm not confident he would've made it out of his predicament without a helping hand. Will update...