Well, it’s easy to try it out innit? Just don’t shift up from the granny for a week or so and see how you get on.
I’d say it’s a bit low personally – I never once found 22/36 useful when I was still using a granny and I think you’ll be surprised how fast you get fitter once you eliminate the possibility of shifting down a gear. I’d do 28t up front if I lived anywhere really steep and technical (running 32t now on not-so-steep-or-technical terrain and my noodle legs do fine).
I also think you might have a hard time setting up a 22t single ring with a decent chain line (which is essential because if you can’t use the entire cassette then it’s going to be really limiting IMO). Single specifik rings are available in 28t (and maybe even 26t, but surely no smaller) for spidereless SRAM cranks, for example.