It's gonna be tough to get away with not paying for private through commercial. There are some flight schools around, especially in FL that will pay for CFI/II if you sign a contract to instruct with them for a certain number of years. If thats how you want to build your hours. If you want it to go as fast as possible through the instructor route, you'll probably have to pull out a loan and go to a place like ATP or an equivalent that'll get you zero-hero (CFII) as fast as you're willing to go. What I would recommend, if you want to go corporate, is finding a flight school that also has a part 91 charter operation. Something with a pilatus or king air 90 or something like that which doesnt need a type rating. Once you get your commercial they may get you trained on those and build hours that way. Best advice I can give you is to call the flight schools in your area and see what they have to offer.