I will say that claw mounts would be the best option, although for some reason the OP ruled them out. Classy, sturdy, easy on-off and absolutely repeatable in terms of zero.
Both Talley and Recknagel are also fantastic options.
I will also say, though, that I have never fully appreciated the need for quick detachable, perhaps with the exception of a true stopping rifle (which the .375 really isn't, as much as I adore the cartridge). Either the rifle is scoped--and the scope stays on--or is used with open sights. I've never known a hunter who took his scope off in the middle of a hunt--or quickly mounted it on an unscoped rifle in the same situation. Modern scopes and modern mounts are also extremely unlikely to fail in the middle of a hunt.
The one other exception I can think of is for travel, whereby the hunter keeps the scope in a separate suitcase or carry-on to make sure it doesn't get lost, stolen or damaged, but even that is a long shot.
I'm sure I'm missing something, so I am very much open to being enlightened and learning something new.