Also, coming back to my earlier point, I ended up, while doing this study on HE, speaking to a lot of 16 - 18 y olds who had been HE. Without exception, they had either no GCSEs or a smattering of not very high grades at GCSE, eg, one B, one d, one e, and that was all. And these were kids who were definitely bright. They just hadn't had the teaching and input - nor put in the time themselves - that you need to get your 8 As or whatever. For that, I think you almost certainly need school.
You may think that GCSE grades aren't important, and the kids can go to FE school and get some more in their own time post-16 anyway (and some were, very successfully). I'm not sure I would be confident enough in the value of HE to have them end up with the sort of grades that in a school-going kid would suggest "straight to a Mc Job" when in fact they were actually much brighter than that. Woudl be worried that the kid would set their sights too low in life.
I haven't looked into what unis and colleges say about this, whether they would be understanding and make allowances.
Also, Boden bae you need to think through whether you want to spend YOUR days socialising with rather a mix of born-again Christians, libertarians and mums who just don't want to be parted from their children, ever... oh and some nice sane people too - obviously!
I hear what all you HE-ers are saying and am sure you are doing a good job and your kids are flourishing. I just have memories of going to see a "Maths" lesson and the kids (aged 7 and 9) were making pretty pictures with those Hama beads - what a load of crap, frankly. It was not Maths, just passing the time with some not very exciting craft. The very nice, very caring mum was totally kidding herself that it was of educational value.
Money-wise, you need to be sure you can do without your income, long-term, for years and years as would not be fair to hit a rough patch, get a job and shove kid back to school, would it?
Also you have to provide swimming, PE, drama, cookery, history, geography, etc etc yourself and some of that will inevitably cost money. The parents I met who were doing a good job keeping their kids interested and stimulated were forever off to London to the science museum etc, quite pricey if you live far away.
I've always thought I'd like just one extra day a week to do stuff like that with my kids, but their school won't hear of it.