I read the scenario. and it sounds like that I would have to GV at the end. I would really like to try one of these scenarios, I hear they are really fun......................BUT, I only fly Lightnings and nothing else. No GVs, no other planes, only Lightnings.
Would I still be able to join or would my stubborness preclude me? 
You can of course register for Lightnings, but, yes, you do get 2 lives in GV's if you run out of lives in Lightnings.
If you never died more than twice in your Lightning, you wouldn't need to drive a tank; but if you died twice in your Lightning and then would refuse to help in a tank afterwards, this scenario is not for you.