Here's how security clearance goes. I myself personally grant you an interim top secret nato cosmic security clearance. Just like that. No national agency check, I just decide. It's good for six months but just on a whim I can extend it another six months. Not kidding. How did you think that worked? Do you know how long a BI takes? Guess how long an SBI takes.
25 years after my time on USS Connole where I got the TS NATO COSMIC, the guy doing my SBI told me he had retired with my package on his desk and a year later came back on the job as a contractor and there was my SBI still on his desk.
I'm like other people. I lived in 45,000 places. Good luck doing that background investigation.