Perhaps I misinterpreted your question. I was under the impression that the control system you mentioned was to supply the 0-5V signal, instead of being taken directly from the pot.
In that case, Nigel is on the right track, using an opamp to buffer the voltage at the pot wiper, and then using a resistive divider (one resistor 14k, the other 10k. Still, the 100k pullup will affect the accuracy a little, so if you want to improve that, buffer the output from the divider again before taking it to the uP.