I'd consider a remote control IC, something like the Philips
SAA3000 range for example (discontinued, just a reference
off the top of my head)

http://www.semiconductors.philips.com/pip/SAA3010_CNV_2.html

I used to use the SAA3004 for a 9x8 keypad. Very simple 2-wire i/f
(data and key press interrupt). The only problem for you is that the
SAA range wouldn't do multiple keypresses, but others may be able
to, perhaps those designed with Shift/Alt/Ctrl-type functions maybe

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