Bravo on the self grounding! You are blessed to haven been able to fly so long. Hopefully you still lurk around POA and the local airport. Your input and experience is valuable.
Go find a King Air pilot with MEI, do a few trips right seat with him. He can log you dual received and give high altitude endorsement. Get some real turbine IFR Multi experience. That would be more valuable.
660 will show plates if you buy the subscription, but the screen is quite small. I think an iPhone backup to the iPad is a better plan…then maybe the 660 for worst case scenario.