Just buy an open assist Benchmade. Under the length limit. Bullet proof (or cheap service). And if you dont trust the stability of a locked (and safety on, so to speak), you can't trust a fixed blade. Depends how fast you need to deploy, but I'd bet a good Benchmade would do the job without a massive holster. Just my experience. And I dont live in AZ.
I used to own the Benchmade and I loved the assisted opening; button shy of a switchblade. But then I cut an orange and discovered how flawed the assisted opening really is. Just some left over juices resulted it being sticky in certain areas and that resulted in the blade not opening fully. In short an orange is what defeated the assisted opening.