Can clones be made from fast version strains? I ha...

Yes. Only autos are "un-clonable".

Once they are fems and flipped by light change Photoperiod fasts not auto

yes you can. However their are two "versions" of fast flowers. Pure photoperiods who just happen to finish a week or two faster then their other counterparts & and photoperiods whos have been crossed with an autoflowers making a photoauto hybrid or "Fast" version The issue with the latter is that is sometimes just turns out to be a auto as genitics are a bit wonky and so inbreed. So as long as its stayig in veg and not flowering clone it out. Maybe even try revegging it. then taking clones and growing new.

Sure! I cloned from fast versions quite a few time. However, cloning does depend on the strain and phenotype. My experience is that you should take fat health branches to clone. This sacrifice some of the best cola that could have produce big juicy flowers. :(

As long as you're working with a photoperiod plant and not an auto, yes you can clone it.