Ha!, Which Swordplay? Final Version (2012)? Final Version 3.1 (2014)? 2015?
I'm doing a similar thing with 2d6 Sci-Fi, using the Skeletal Undead stats from Swordplay 2018 as the zombies. Basically all Rep 3/AC2 with "Never have to take Will to Fight" test and "Must re-roll 1 passed d6 on Action table".
Seems to work very well.
Good luck, M.