1- the Pachmayr LoSwing worked on a .375 Improved after Warren Page's (no connection just emulating a hero)
2- for my own, in my dreams, bigger game rifle it's screwdriver removable scope and emergency irons peep - that's for fun not miserable conditions.
3- for my own general purpose rifle it's Leupold lever style QD and emergency peep irons but that's really more for a rainy day than any contemplated emergency.

Historically I used the old Lyman deluxe receiver sights with a blank slide when the scope was screwdriver mounted again mostly a rain and snow alternative. I wouldn't know where to buy the sights these days and as for blank slides maybe an auction site?

I wonder why the S&B Short Dot and such aren't used more in the field? It's been many years since I realized I was wasting my time trying to see open sights and I'd seriously consider a red dot and a 3X auxiliary on my .375 for fun.