@WobbleWhenIRun I've been thinking a lot about what rules I want to try for my November maintenance fortnight, and the rules I think I'm settling on aren't dissimilar to yours with 'saving up' extra calories. Here's what I'm planning:
Monday-Friday TDEE -200 calories. It's going to look pretty similar to how I eat currently, with just two rule relaxations. I'm going to allow myself to eat pasta so long as it's within the calorie amount, and also any kind of fruit - when I'm on diet plan I don't have high-sugar fruit like bananas or grapes. Those are the only two changes, plus portion sizes can increase a bit. No empty calories of any kind, though.
Saturday & Sunday TDD + 500 calories which can come from larger portions, snacks, takeaways, breakfast fry-ups, or a few drinks in the pub (obviously not all on the same day!). I know that looks like a lot of choice, and choice is something that has derailed me many times in the past. But if this is going to be sustainable for the rest of my life, I need to be able to have those things in moderation, occasionally, and in the context of an overall healthy, balanced and calorie-appropriate diet. So I'll give it a go. If it all goes horribly wrong it's only for a fortnight after all.
To make things easier I'm going to have a shopping rule. I'm not allowed to buy any cakes, packets of chocolate biscuits, multipacks of sweets, chocolates or crisps, or tubs of ice cream. I know that I can't eat these things in moderation - once opened I can't stop and the whole thing is gone. So if I want a Mars bar for a snack, I can buy a single one, not a four pack. If I want cake it has to be in a cafe where I can order a slice and eat a slice. Hopefully this will stop me going into full-blown uncontrolled addictive eating the moment I have choices to make.