This idea of a MD being a PA or RN is absurd. Most MD's only need one year to be licensed. Once licensed, you can open your own clinic. Many people do not care if you are fully trained or not. They pick their doctors because the doctors take care of their concerns and they feeling good that they came to seek your help. You can accept medicaid. It don't pay much but you can still earn six figures. Most BC MDs won't even take medicaid.
But there are other benefits. You'd be surprised how many grannies on medicaid know how to cook and bring their creations to cheer the office. Some of the recipes will die with these women as today's women may not have the same interest in learning the oldest path to a man's heart.
Sure you cannot get privileges or pursue academic medical practice. But you can still pursue academic research. The pay sucks but the lifestyle can be good. It's still very competitive though. You may still face prejudice from other MDs who have finished training.
The thought of even becoming a PA or RN suggests that you do not have a license or that you have drank the cool-aid. The desire to be accepted by one's peers can interfere with what you have already achieved. You are doctor. If you want to practice as a doctor, then just do it if you are licensed. General practice is not really that different from IM, FP, or PC.
As for insurance, you pay the premium based on what you do not your education level. An OB-GYN who restricts his practice to just primary care will pay what an internist pays. You might get a slight discount for being BC. If the insurance co. still won't cover, find another that does. You might have to move to a state where a provider will cover you such as a poor state.
If you do get sued you will be held to the same reasonable physician standard just as everyone else is. Contrary to myth, it is very hard to lose a malpractice suit. Mechanisms are in place such that if you lose, you definitely did wrong. Law affords medicine much deference. It's not like residency where the remote possibility of something going wrong can bring about a charge of incompetency. In law you actually have to prove negligence and actual damages. So spend a hundred bucks on used MKSAPs and spend time memorizing stuff in there. If you passed all three USMLEs, the MKSAPs should not present a problem.