Wouldn't the "buttburn"(the jet off quickly and hit the glass with their cuttlebone severly brusing the soft tissue behind it) problem that some get with cuddle fish when they get scared, be a much more frequent problem with squids? considering they move around like that more often, and also their pen is alot pointyier than a cuttlebone...just you'd need a pretty big aquarium to prevent this from happening. thats just my 2 cents there.
Other than that it sounds like an awesome idea nd if you o get some, be sure to show pics ^_^.