This is definitely a difficult decision, but depending on the location that you'll be flying C-12s from it may be a non-starter to achieve your end state. In most locations (save Futenma) as a Captain, you'll be picking up scraps for flight time from the transitioning 0-4s and O-5s. Unfortunately these guys are trying to do the same thing your looking to do. So you may average 200 hours a year in the C12 which will still put you 400 or more short of what the nom-regionals are looking for from an applicant.

Now if your able to get a billet at Corpus and instruct C-12s there (yes helo guys go there and instruct c12s) you'll come out of there closet to the hours you'll need. Additionally, you will be able to milcomp your MEI, MEII after you take the MCI exam. As a WTI, you should be able to write your ticket there, but i would keep that between you and the monitor, leaving your command out of the comm loop.

Getting to corpus would also ease your transition into the reserves flying fixed wing on either the Navy or Marine side of the house. Which could provide some peace of mind should the industry tank again.

Having recently wrestled with similar choices, albeit at 14 vice 10 years, its tough. Just make sure to look at all of your options before focusing down on the primary three when you move forward.

PM if you have any specific questions on the above.

Best of luck...