the Wargames Atlantic skeles might work. You get 8 sprues (all the same) but include a skele with separate torso, arms & legs on each one. You could probably chop up the ones with legs & small base attached to the torso without too much difficulty. Although the box says 32, with the one in separate bits, it's actually 40.
You could also try the Mantic Games ones which are armoured but you can buy individual sprues on their website (
https://www.manticgames.com/games/kings-of-war/undead/).