FWIW, I’ve just started a very simple beeminding of finances. I have a “fun money” do less goal in which I manually count everything in a small category of expenditures. Current list is anything where I’m doing something out rather than in (buying a coffee rather than coffee beans, drinks at a bar, etc), any purchase of alcohol, desserts or snacks, fiction books. Essentially things that are obviously luxuries or things I should be doing a bit less of anyway. I then just manually enter them into a goal on the android app and have a weekly budget.
It’s low-tech but is very in keeping with my use of beeminder as primarily a behaviour change rather than life tracking tool, and so far it seems to be working pretty well.