Honestly I can't see any good reason for not doing this in AppleScript entirely. Launching ScriptEditor and typing a couple of tell app "abc" to run commands doesn't look harder than using the Terminal and pico - it's even easier and will give you a perfectly double-clickable application.

Also doing it this way avoids using the application's path, which is a good thing.

Even if you really need to do some command line stuff that cannot be trivially achieved in AppleScript, you can still execute it from an AppleScript without any hassle and don't need to worry about using the Terminal, it being double-clickable and all.