Someone here posted a video specifically about a Stanley Clarke bass, (same general body/scale balance-wise) and had come up with a way to hook the strap to a belt loop. Or something. Lemme think about it. It's here.
*Well... I'll be dipped in... you know. I can't find it. If it was a serial number, I'd have zoned-in on it in minutes.
Anyway, the jist of it was, in addition to his regular shoulder strap, he had a secondary smaller, short one that fastened to the butt-end strap button, and hooked around his belt, or belt loops. It kept the bass from tilting. And helped hold his pants up was the punchline.
I know it's here somewhere.