I would use it for trading stock, just like how you got it. The generic AC units were not designed for any specific vehicle, but as a one size fits all, and we all know how that works or rather doesn't work.
So how bad do you really want AC? One could install all OEM components and have a factory look. Not cheap, but keeps an original appearance. There are some newer setups that would look better than the ugly rectangular unit.
One other option is to find an original "true" dealer add on. It has a very thin profile and runs under the dash and has the contour of the bottom of the dash frame. I have only seen one in my several years of looking at cars. I think I still have your contact info Tom and will attempt to send you a picture of it.