From a blade use perspective, striking using that drill is more of a stick drill than a blade drill. Just saying. Also, yeah, I thought the gladius was shorter but didn't the romans also have a longer version for guys on horses?
So it doesn't surprise me that a FMA guy might pick up a Gladius and go, "hey, I know how to use this." In the same way I wouldn't find it a bit odd for a Roman Legionary (magically transported through time) to pick up a straight bladed Kris and go, "Ego gnovi quam ad usuus hic." (well, you didn't expect him to speak English did you?
Yes, I would. No half-rate magical transportation spells that don't include language translation accepted around here! We got enough babblers... If you're going to bring me a legionary, he better be able to talk to me!