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BTW I moved to "33 from my "31. No clearance issues.
Have you thought of using taller shackles on your front leaf springs? I haven't heard of anyone doing that but I just looked at my K10 and they're pretty short. Stout but short.
I don't think chains would be a problem, looked closely at the clearance when putting them on. Now if you're talking about gunther chains instead of the plastic girly ones, it might rabbit, it might...If you do the upgrade on the springs, (which it seems you need) why not elongate the shackles? You get a two-fer!