You are a lot more patient than I am. If you can fly that stryker, then I suspect you'll not have much trouble flying the nexstar. Just take it easy, and don't over-do it. Remember, you don't have to fly full throttle. Half throttle is a lot less intimidating. I'd go do it. Especially at the airbase--there isn't anyone who can stop you. Just be careful. I suspect if you can fly heli's, the stryker, and have that much experience on the sim, then you'll be fine. But, you may crash and burn. Either way, the plane is doing you no good right now.
I hate it when people aren't willing to help new people out!
I usually do not advocate doing it on your own. but, it sounds like you've exhausted all other avenues. If you truely have the skills you say you do, then why not try? Don't try, however, without AMA coverage!

One other thing--asphault isn't all its cracked up to be. A nicely manicured grass field is sometimes a blessing. Especially for hot landing airplanes.