> Any other ideas?

Make clear to the one who created this requirement that it is 
excessively expensive!

Maybe you can find a cheap driver chip that can do everything, and put 
such a chip on every pin. Do the routing at the input side of the driver 
chip. The receiver can probably tolerate an analog mux in series.

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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