I don't have an opinion to offer you except it is good to see you enjoying the finer things in life and besides this silly ice/dry tooling business.
Bindings are measured by boot length, in mm rather than size, but I bet you would do just fine with an XL. I have the L's and I take a 10.5/11 boot size, and there's not a ton of room for expansion. I am only guessing though.