I would say there are plenty of breeders (not propagators) that would be more than willing to set you up with breeding birds of high quality, if you had demonstrated doggedness, determination and ability in working with chickens, and a dedication to the breed chosen.
Breeders working together, with the same bloodline, on different details is not uncommon. The catch is that you have to become a breeder, not a propagator, and that requires having a mentor. What better mentor to have than the person whose bloodlines you are starting with? That where reading the 800 pages comes in - it takes a lot of home work, and preparation.
Starting with eggs and chicks is really just a roll of the dice, and will take you 3-4 years to get them ironed out and dependable.
Started birds and a mentor gets you a hand to hold onto, and two years less floundering and feed bills... you assign the pricetag you're willing to put on that one.
Oh - and BCMs ain't easy!
ps - but with homeschooling 4, you have the perfect set up, a small army of helpers, and a small army to feed those culls to, of which there will be a plenty!