I think you are right. Neither of us are paper and pen budgeters. I use my Discover card to buy absolutely everything to get rewards but also because they put everything into categories for me. I just checkin to make sure I am not overspending in a certain area. This has worked fine for me. He doesn't budget at all, he just lives below their means. So trying to do a budget neither of us want will be a waste of time and frustrating. Offering a set amount is a good idea.
Tomorrow I am bringing up the 1/3 thing, that that is the fairest way to go. I have a feeling I am going to get pushback. But I am prepared! I will point out that I only use 1/3 of the toilet paper so why am I paying for 1/2? I think I better come up with better reasons before the conversation, lol