See if you can do some unpaid leave and try it out. It might be a little underhanded to try out the Beechjet job while keeping the airline in your back pocket, but corporate flight department are famous for pulling the rug on pilots. I knew one who had flown for an individual for 20 years and then he got dropped without warning at 50 years old because a local 135 offered to staff the plane in return for the use of the plane, plus income. It was in the fall before Christmas too.