We have one plastisol white for anything but 100% synthetics so it would be all good for us. A press with central oc would make that more or less a breeze, just have to adjust pressure a bit perhaps and flash temps/times.
Now if it did require an ink change, such as going to 100% poly, we would do like Eric and charge color changes (on all colors, not just the UB b/c we don't mix low cure an reg cure in a run) and then a charge per loc for the Performance ink.
I do encourage my co-workers in the office here to break off a job to separate orders if it's not a super easy changeover from garment to garment.