Dyche would be another disaster waiting to happen.
You can say what you want about the quality of the SPL or the sides up there but the pressure and expectation at Rangers and Celtic is possibly without rival in English football. I mean someone like Arteta can have 6 years of "building" towards winning the league and still not manage it, and be relatively safe in that job. Dyche is a good manager with a good record, but his working expectations have pretty much topped out at "massively overachieve just by staying in the league". It's just not the same.
I know there's a lot of water under the bridge around Ange but Rangers need to target their version of him. Easy to forget that when Ange arrived, Celtic had just lost the title to an unbeaten Rangers and were regarded as being in transition, and I think Celtic fans were just as wary of "he's not managed anywhere of note" as Spurs fans were about his time in Scotland. But he arrived there a winner, albeit at similarly smaller leagues, and left having built on that. Rangers need someone who knows how to win. Even if that's a "lesser" standard than appointing just another guy from the EFL.