So in answer to my own question.....NO. .....nobody makes a good quality 26" unicrown mountain bike fork any longer.....
And why would they, when the industry now puts 26" as children's bikes or for those under 5'5". Which is also a bit sexist, as it assumes a shorter woman won't be a good rider and therefore won't need a decent bike!
Yep it's infuriating, the 2nd hand market is littered with 26" bikes with crap or broken suspension forks and the options for replacing them with a decent rigid fork are so limited. Especially if you're over 6ft.