I feel for the OP too. I'm very tired and want to post and interact but can only manage short posts/ sentences or I just end up garbling. Or conversely, one long post like this, and that might well be it.
Also it can be hard to keep up with a thread if you don't make short posts. I'm not a long-time user of forums so perhaps this is my lack of practice or familiarity. Might be the same for the OP.
The only thing I can see that I consider too strict is the not changing out of uniform. I think the deal should be that they pick up their clothes and co-operate with the washing schedule given the limited drying facilities. If they leave the clothes and the cat pees on them then they clean it up and lose out on their hobby that week. Or explain to them that a drier or other solution could be bought if they skip so many weeks of their hobbies! I think they are old enough to undstand this and with DD asking it is a good opportunity to make changes and increase their responsibility.
And DD could do her homework by X o'clock but she has to earn that trust/ responsibility. DS should see that is fair and he could earn that too.
I can totally see why the OP would save on certain things so her kids can have interesting hobbies on the weekend. Kids need to learn that resources (energy, time, money etc) are finite and there is a trade off between everything.
Eating 'early' is not weird or a crime!! It is just personal choice or practicality.
Routine and practicality don't have to mean a joyless existence. Anything boiled down to the bare details might sound that way.
The DCs have pretty much 3 hours a night after dinner to do as they please Then presumably some more time in bed before sleep to think, read, draw, play or whatever. Not exactly Oliver Twists or Orphan Annies