Is it possible to hard-set it to whatever it would take to expand a self-expanding executable?

Click to expand...

That gets a bit funky since self-expanding executables are applications, and have resource forks. So if the transfer is transparently taking care of resource forks for you, you could set the Type code to APPL for application, and the creator code doesn't really matter. Then just run it. But it's a bit sketchy as to whether your transfer software is preserving resource forks for you.