If you were there in the early days, you'll remember that right on the surface was a tight diagonal squeeze past a boulder/flake. That was remove some years ago (allowing the water in the entrance to freeze faster no doubt!) :-\
I never found the vice to be a problem - having long legs, I found the S and Z bends to be more fun (I found cross legged to be best!) The T-slot and trickle-in-the-ear have got considerably bigger over the years - I know that I have and I still fitted a couple of years ago!
Also your oversuit should survive the trip these days, there's not too much sharp stuff in there now - I did the crawl in a wetsuit before the first breakthroughs and it was in shreds, as was I, when I got out. :-[
I always had a sore left hip after doing the crawl (more of a sideways thrutch) in an oversuit, logging up more that 40 trips in the 3 years after the breakthrough. A few years ago it was X-ray'd and looked like crazy pavement with all the evidence of stress fractures :blink:
Looking at your avatar, and having read about other trips that you have done, you'll have no problems.