Oooohhh... this sounds interesting. Does anyone have this .cod or extract available to try? Provided of course, that there is nothing "wrong" with doing so (I don't own an 8703e).
I like ringers that are... well, simple ringers (no songs or music).
Edit: I reread this and this may be the way to go:
The tunes 8700g.cod file is in the 8700 OS. Install it and copy the file out of the java directory for that OS. Then you can uninstall that OS from the computer if desired.