[Excelsior07]

The yellow looks like a perfect base, but like you said, you're probably gonna have to mix and match parts. I'd definitely start with lots and lots of research. The angle of the handle bars on the yellow one would definitely need to raised (closer in position to the way they are on the "american" bike). The tires look great though. The seat and the headlight on the American one might also be cool to use.

Keep in mind the MU Ghost Rider figure might be something like Warpath in height.

Here's something close to what his bike would look like un-flamed: