I just acquired a Bronica ETRSi without a strap and being mainly a large format shooter I don't really know where to start - will any 3rd party one do? I have a strap for my FM2 but the Bronica is definitely in another weight class so I'd be nervous about that one not being strong enough.
I happen to have a leather strap with quick release ends (for tripod work, the strap is quickly shortened) and the ends have an end that is somewhat like a half-split ring to fit the ETRSi lugs.
FIRST, go to KEH and buy the original Bronica D rings that fit into the eyelets on the camera body. I shot Bronica ETRSi and SQAi cameras for years. I used Tamrac N-45? Straps they are great. You can use the quick release function. These haven't been made in years. Hasselblad and Mamiya straps work great for those cameras as they have really nice quick release features. Bronica was more like a Nikon etc.
I happen to have a leather strap with quick release ends (for tripod work, the strap is quickly shortened) and the ends have an end that is somewhat like a half-split ring to fit the ETRSi lugs.