I just had a go at swapping bodies between AOS Kirk and the good Doctor, with relative success.
AOS Kirk uses a Hot Toys type clone body, with peculiarly long arms.
McCoy's stock body is quite large. Really great quality, actually. It's massive and very sturdy.
Anyway, the AOS body didn't quite work for McCoy, because the neck post is way too low, so McCoy ended up having no neck, which made him look pretty stupid, so in the end I used a stock Hot Toys true type, one of the narrow shoulder designs from a few years ago. I had to switch the ankle posts to fit the TT body, but it wasn't too hard to get the posts out of the boots, I just unzipped the boots and (carefully) used some pliers. McCoy's still a bit too broad shouldered and his biceps are still a bit too big, but the uniform sits a lot better. I might try tinkering some more when I have the time and patience.
As for AOS Kirk, the McCoy body works great. There's only two minor problems that I haven't completely fixed: 1- the neck is too long, so I had to take out the socket from the connector, which means the head is being held in place by the black undershirt... BUT... the proportions work now! 2- The ankle pegs inside the boots are two small for the sockets in the McCoy body, so Kirk's a bit unstable right now... I'm sure both things are easy fixes, but for now I'll just leave it as WIP.
Sorry for the lack of pictures, but no camera available at the moment.