Well, I should have thought about something like that.
I bought two USB extionsion cords, i drilled two holes through the brick wall, put the cables through and finished it off with plaster. Looks OK, but not very professional. I might try making a steel front panel.
Persuading the wife wasn't all that hard, by the way. I mentioned I would like a kitchen-radio. OK, she said. Then I said a TV in the kitchen would be cool. She agreed. Then I bought a touch monitor and waited for an afternoon with spare time and no wife in the house and I drilled a huge hole in the wall in which I installed the monitor. The PC, NAS, Modem and cables are in the meter cupboard behind the kitchen wall. And of course a sub-woofer under the stove.