Not if you're doing a NAS show. I've never heard of a promoter allowing it. I suppose technically it's probably at the promoter's discretion, but I'd be shocked if they allowed it.
On the press, the bar probably has to come to below the chin.
Advice on axle deadlift - rack pulls w tyler grips, fat gripz or 4orce grips or something
axle overhead - do a youtube search for a continental clean and learn it, train your push press or push jerk
farmers - walk w DBs, plate pinch and walk - anything where youre training grip and walking. It's surprising the effect that doing something else (walking) at the same time will affect grip. Also, double overhand deadlifts. Obviously not walking, but that will build your grip.
yoke - some SL stuff might help, to an extent, but by and large, you need to try out a yoke
stones - no substitute. Gotta play w the stones to learn em