I have been lucky enough to fly more than a few. I put in a ton of time working on the local airshows and over the years got to know many of the owners. Each and every one of them invited me and other members of my crew out of appreciation for the help we gave them and for our commitment to the events. I suggest you take advantage of oppertunitys to get involved and to show long term commitment. Over time they will get to know you and things will just happen. I wouldn't even hint at your desires, they get that kind of thing every day.
I was very lucky in my B-25 time and to date it is the coolest thing I have ever flown. When ever I am in So Cal I try and stop into the hanger for a visit with the boys, who rememeber me no matter how long it's been. Maybe some day I will have the time to join you.
Good Luck and have fun!