Has the OP checked what it would cost to just book club level rooms for the 20 Marriott nights per year? Assuming that this wouldn't violate corporate travel policy, this might be an easy solution, although it might also be possible to make a case that the savings on breakfast and snacks make doing this cost effective, assuming that the OP doesn't receive a flat per diem rate for meals on business trips regardless of actual expenditures.

Often club rooms are nicer in other ways too and give quick and convenient access to a computer and printer without going to the business center, etc.