Quote from traumaRUs
There was a program in North Dakota that was 13 months long for RN to PA. Don't know if it still exists or the name - sorry.
I believe you are thinking of the University of North Dakota PA program. This was a MEDEX program primarily for RNs. They have changed the structure and now have two arms one which takes clinically licensed or certified providers with three or more years experience. This arm requires you to apply with a family practice physician as your primary preceptor.
There were two other dual NP PA programs at Stanford and UC Davis that offered PA and FNP certifications. Stanford no longer offers the NP option and its expected that UC Davis will stop offering the PA option when they change to a DNP program. Actually looking at their web site it looks like the FNP and PA programs are separate programs. Its not clear that you can be dual certified.
For the OP I see a number of obstacles. That's not to say its impossible, but the odds are certainly against you.
The primary issue I see is convincing a program director to take you. You have already completed training as an FNP but are unhappy with it. There is a limited number of PA seats so you would have to convince someone to take a chance on you.
You would have to complete the pre-requisites which involve 1-2 years of coursework. Much of this has time limits such as within the last 5 years. Much of your nursing pre-requisites will not count.
While some programs do not require medical experience preference goes to applicants with medical experience. Generally time as a student doesn't count. Its unclear if you have worked as an NP. That time would count.
An approach with a higher element of success would be to do a post grad ACNP program with a program that will provide clinicals in the areas you are interested in. This could be followed by a post graduate course. FNP/ACNP would help see the full spectrum of patients. Some areas such as ortho would still be difficult but possible specially with a residency.