Bowwow, lets get this straight. YOU are planning to go somewhere on vacation that does NOT have a minyan. You are only planning to go there because there is a caterer who happens to be making a program there for the benefit of people like you who want to take their kids on vacation during school break. Obviously a caterer has a right to make a parnasah, so he works out all the details so that people like you can enjoy a nice vacation with their children and not have to worry about kosher food, minyan and “Shabbos Locks”. He does all the research and planning, having found this particular hotel with Shabbos locks, etc.
Now YOU want to go on his back, avoid his program so you don’t have to pay him and allow him to make his parnasah, cut him out of his own deal, try an get a room in the same hotel, and use HIS minyan. Hearing that the rooms will be available only to the people who register and pay for the program, since many people think like you and try to cheat the caterer of such programs, you are now thinking of calling the RAV Hamachshir because you feel he is NOT KOSHER enough if he blocks you from a minyan. You justify this by the fact that you are a chiyuv.
So here is MY take on it. Since you are a chiyuv and you need a minyan for Shabbos, YOU should find someplace to go with your family where there is a local minyan so you don’t have a problem. On the other hand, you can pay a little more, join a program at a place the kids will have a good time, your wife will not have to worry about food, and you will not have worry about a minyan. It would seem to me that YOU are going about this backwards.