I have ideas along a similar theory from time to time, which probably explains 6 bikes..oops..
A good well sorted hardtail is still a geat bike to ride on 99% of UK trails unless out and out downhill etc.
The last ht frame I built up was a 456 evo2 and I didn’t go too big with forks at only 120mm. Built like this I believe it rides nicer than the Soul, Piglet (1st gen), 2011 Zaskar and a few others I built with the same components.
It was also the only HT that I felt compelled to leave and actually use instead of just swapping bits out. Still have it and did a few rides in North Wales last week.
For the peanuts you can pick the frames up for, I’d suggest having a go with one.