anyone know if you can unlock kill strike with pyro?
Provided entropedia info is correct (it's incomplete, but not necessarily incorrect), yes you can, but only by double-indirection, and with so much skills in pyro it'd probably be cheaper to buy a space shuttle.
Remember: Skills is a combination of the Attributes they are made up of, and how much money you have spent (on those skills). For skill points in "Pyrokinesis", 50% of those comes from (went to) "Pyro Kinetic (Hit)". That in turn has 2% Intelligence and 3% Psyche.
Intelligence has a 5% influence on "Gunner (Dmg)" (do note that
only "(Dmg)" "Skills" contribute to "Kill Strike".
So if you gain 100k "whatever" into "Pyrokinesis", 50k of that goes into "Pyro Kinetic (Hit)". Then 1k goes into "Intelligence", and out of that you gain 50 "Gunner (Dmg)".
Repeat for the other permutations.
So the answer to your question is "Yes". It is, mathematically, possible.
If you however wanted to know if it's feasible within one lifetime, I'd be inclined to say it's not possible.