The only thing approaching "secret sauce" is the BIOS modding, which varies in difficulty depending on the device. For many devices it's just a case of reconfiguring strap resistors.
Unless you can put money on your words and provide some sort of guarantee, nobody is going to take that.
In practice, it's more like a 75-90% failure rate if you're unfamiliar with ball-soldering techniques, which most are since it's been considered impractical to do soldering in the US since the through-hole days, and so there's not a professional tradesman class to teach kids. What does exist of soldering is stuck in the far past from an electronics manufacturing perspective.
Tl;dr: https://xkcd.com/2501/
This can be a result of unexpected and costly if not worse, surprises.
Racking in money printed out of thin air by banks using a sleight of hand then forcing people to give us things in exchange for said printed money under threat of being bombed, invaded, and sanctioned
Hot air station, stencil, stencil frame. preheater, etc. Even board view sometime need to be purchased.