The 2E ruleset is free and my extension that sits on top of it for Hackmaster is free, so you don't need to buy anything to try it out, assuming you already own Fantasy Grounds.
This got pretty close for my purposes. It has the correct stat modifiers, hit point kickers, critical hits, initiative, threshold of pain, honor modifiers to dice rolls, armor damage, penetration dice, etc. Fatigue is close but not quite matching RAW.