I could have done it, in fact not too long ago I sent a preserved centipede specimen to Germany, so it's doable. Buuut these guys are gone now though :/dang, i am seriously tempted to try to get those specimens from you!
but i am broke as a bad joke and i think any useful structures would degrade shipping it to the USA
i'm real sorry for this man. i think if you freeze the remains and save it maybe someone can use it for some science at some point inthe future.
ACTUALLY freezing would be really bad, now that i think about it. the ice crystals would probably slash up the very microstructures that someone might be looking for. i guess an alcohol storage solution would be the best
have you read how to preserve dead bugs in alcohol? it isn't that tough, but it is a multi-step process to get it right