How one of the comments suggests to have the COM write-out an EXE, you could do something similar on OS X. Applescripts can be entirely in a resource fork, have

How one of the comments suggests to have the COM write-out an EXE, you could do something similar on OS X. Applescripts can be entirely in a resource fork, have that write-out a macho-o and have the data fork be your previous polyglot.