I'd suggest proposing 75/25. Or perhaps two options:
1. 75/25 split of EVERYTHING
2. An agreed-upon 100/0 (or 0/100) split of specific bills. Set this option up so that it's MORE favorable to you, not LESS.
Yes, you can impute income in an eventual divorce action, but you have to hire an occupational evaluator (at your expense). For now, something very simple should suffice, and I'm guessing that even using her PART-time income, either of the above two option would be SUBSTANTIALLY better for you than what you're paying now, and would enable her to wear her BGPs.
