Just switching the heads from one balljoint to another.

I was wondering - if they ever release them in a way that anyone who isn't a North American scalper can get their hands on a set - that if you had the Earthrise Skywarp/Thundercracker set and any one of the Siege seeker/tetrajet molds, would you be able to switch out the screaming Skywarp head for a tetrajet head so you'd have a less goofy expression but with a slightly different headsculpt for variety's sake, as well as potentially mixing up the tetrajet faces a little (for example on Hotlink or one of the Rainmaker trio if you have/can get a hold of them too).

Not that it makes much difference for most of us right now what with that good old Australian TF distribution...