Developing a film without opening the cam...

Am i right in thinking the keystone is a old 8mm movie camera? Never had any experience with movie cameras, or developing their film- I'm goin to assume its like 35mm developing, apologies if this is completly useless advice.
I'm fairly certain you will not be able to develop film in camera (camera will end up pretty wet). If the problem you have is actually getting film out o the camera I'd suggest a changing bag- basically a light tight bag that you put the camera in with your developing tin (if your home developing) or canister if your using a lab, you then have to put your hands inside 2 holes either side and transfer your film from camera to developing container- blind.
I'd advise doing a couple practice runs first with some old unused film just to get the hang of it- it can be tricky.
Again I have no experience with 8mm film processing but I'd imagine the principles are similiar.
You can get hold of changing bags from most photographic retailers, and always follow instructions that came with your film.