I too totally understand. I don't know if I am ASD but my son is and we're all OCD and very German. Like, our house has to be clean all the time. It's a precision project. Add pets to that and well, it goes against everything we stand for. Actually, we do ADORE our pets. But, I get it, OP.
We have a large gun dog and two cats, one which is a real shedder and it does drive me nuts. But firstly, in your case, the kitten phase is as hard as it gets. So the stress of them being kittens will add to the overall stress you are experiencing. This will get better.
Secondly, I recommend getting a robo vacuum for the main part of the house Just make the main part of the house their domain. Get a couple of cat scratchers. It doesn't have to be anything wild and crazy like a cat tree. We literally have one slant board type scratcher which works great.
Is there any possibility you can make the cats outdoor cats (this helps MASSIVELY)? There's no way I'd have litterboxes for life. No can do. It's just gross and to me, this is the one thing that you really should eliminate.
Litterboxes as kittens? Sure. But once they're older and outdoors, that's where they do their business. Don't poop where you eat applies to cats too.
I keep everything clean-as-I-go, run the robo vac in the morning and sometimes before bed. I keep a spray mop to hand and just give the floor a once over in the morning and sometimes in the evening, wipe down surfaces, keep the duster handy.