My 2 cents worth is:
As long as the earth connection is part of the multicore cabling and the function you are selecting is not critical enough to be effected by contact bounce, (which could be defeated in software anyway), then you should be OK. I would certainly try this way before goping to other additional components. I have in fact done similar with a timing unit where the remote switching just selects the function but not the starting or stopping of the actual counting. This is done in software at the main unit and has nothing to do with the remote gear.
Peter Moritz.
Up the bush, Western Plains,
New South Wales,
Australia.
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