Listen to Tidge.
Your professional experience is valuable, but as Tidge pointed out the "gatekeeper" might be simply looking for x years of experience - look at the advertisements. Their language reveals what they expect in a new hire. It is unusual to find employers stray from that among applicants they intake in the usual way, that is answering advertisements. If you have ASQ groups who meet in your area, you can potentially meet professionals there and network your way into a role. I have never succeeded at this though, even when the QA Manager I was trying to network with was in my own organization and already knew me. Clearly he didn't think as much of me as he did the person he moved into the role I was coveting. It must have been my magnetic personality.
I eventually moved on out of that employer, as I have always done.
Your years of experience should, indeed help you to take the exam because there are time-in-industry requirements for each.
I passed all of my exams via self study which focused on the Handbooks, select additional references and purchased test question banks. I used the test question banks to look up the answers because I find myself absorbing more that way than simply reading the handbook like a novel. It is just my learning style, yours may differ.