Dude, I was an Emerg doc. I just finished the 5 year diagnostic radiology residency and I am starting an interventional radiology fellowship. I am married with small kids.

Don't go back to school for 5 years. The price you pay with respect to not seeing your kids grow is too high.

Follow the self-study route. You can always hire technical people to assist you.

Here is another perspective: If you live a comfortable life and have a beautiful family, why not enjoy them?