Hi Gary,
Anything is theoretically possible and loads of decoders still have a DC mode. IMHO if you run a sound decoder on DC you will always be disappointed by the result.
Some people may regard the following as facetious or a bit extreme, but I have learnt by experience.
My simple rules for avoiding foul ups of many sorts (mainly blue smoke, an acrid smell, and an out of pocket experience) are:
1. Do not mix DC and DCC in any form.
2. When tempted run DC on DCC or DCC on DC, remember Rule 1.
3. When tempted to fit some sort of clever switch to allow you to move from DC to DCC or vice-versa, remember Rule 1.
4. You ignore Rule 1 at your own risk.
John K