Fanta,
Whilst indulgence sounds like a very cheap option for what you are trying to do the prospect for failure with all the current constraints in the AT world are extremely high, without even factoring in the TG that administer the indulgence system
I recently flew to Vegas with Virgin for not a huge bag of money, excellent service and the guarantee that barring a huge disaster the flight will go and you will have a seat on it with no danger that Major Chumley-Warner-Smythe and his group of chinless wonders will simply have you bumped off the flight at the very last minute.