I have gambit, normal slowking (used to be tornadus-t), iron boulder, ting-lu and raging bolt. The one I swapped out was tentacruel for avalugg. After testing it a bit, it is decent. It is scared the ever loving crap out by anything that has a miniscule chance of having a special move, but if they don't it walls them forever. Ice+fighting moves are quite good coverage, as only volcarona, primarina, toxapex, skeledirge and ghold resist both moves. Which is actually more than I thought, but most other things in OU are hit super effectively by one (don't quote me on that, I may be embellishing my claims a bit.)
Honestly sounds kind of cool, I'd be willing to give it a try. TIL it also gets recover, which is great.
The only other option I could offer is bulky blastoise. It has decent mixed defenses, plus it has pretty good coverage moveset. Sadly not as strong as avalugg and no reliable recovery, but another shout. You also get the surprise factor of the one person NOT using shell smash.