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Very good idea...and very easy to make also, (well for me at least lol)
I too at one point had an idea like that but unfortunatly I have bigger plans than that now.
oh by the way, if you do decide to do it, I would not recommend to use the PS/2 keyboard, but rather make your own decoding scheme for the keyboard, you'll have a better control over it meaning you will be the one who decides what parts to use and how to handle it rather than having ps/2 additional circuits, but nonetheless you will still have to do "plenty" of programming in order to have a meaningfull running capabiliy