playing more tables is not in the terms of the question, but yeah playing more hours would be alot easier, i think that is where you could easily set a breakeven point, obviously 50% give up of winrate and you have to work 2x as hard to make the same, so i'd say the breakeven point would be about 66% or so.
but i think i might take an even worse offer for the lack of stress, i think zero stress in your job would be very beneficial to your health and worth a decent amount of money.
just think of all the money you have wasted when tilted, i know i go on tilt spending sprees sometimes, i have a friend who has a penchant for robotic dinosaurs when tilted which aren't cheap