I believe all but a few states require post-graduate training (residency) for Pods to get licensed. I think this ranges from one to two years depending on the state, but I'm not 100% sure. However, all Pod residencies are now three years long, so earning a DPM and doing residency is now a 7 year investment total.
I think it would be a good idea to focus paying off your med school loans by practicing as a radiologist first. If after awhile you still decide to pursue Podiatry, then put away enough money for 4 years of Pod school (living expenses, food, etc, around 200k total). That way you won't have to take out any additional loans and won't have to worry about paying off prior debt neither.
I'm only a pre-pod so take this with a grain of salt, but from what I have learned, I would strongly recommend completing a podiatric residency. I feel that it can only help you.