not sure how you could do it but it would be interesting to see these compared to 15X binos... for me, I debate using 15x vs smaller objective spotting scopes.
I have a Kowa 554 and Swaro 15x56 SLC's. I agree with the comment that they serve different roles. The Kowa is very clear, but it's not what I'd call a comfortable spotter for finding game. The eye relief is a little bit limited, and the field of view is a little small for that use for me personally. I feel like the Kowa excels at evaluating an animal, keeping track of one already found, etc. It's a great optic for looking at an animal, just not for finding one. For comparison I've owned a Swaro STM65 and a ATS80HD in the past. I decided that packing the small spotter and 15x binos was better for me than packing a big spotter often enough I sold the big spotters.
The 15x binos in comparison are the best tool I've tried for finding game. Mounted on a tripod the big field of view lets me catch little flickers of movement I'd miss with something less steady or with a smaller field of view. They are a significant advantage over my 10x Leica binos from a tripod for some hunts. Mule deer during October rifle seasons are a great example. Deer are not easy to locate and having the binos on a tripod helps me thoroughly check each shadow when glassing a hillside.
Downside of the 15x is that I can't see the same detail at distance I can with the spotter. It just does not have enough magnification for my eyes to replace a spotter for evaluating game most times. I hunt elk late in rifle season when there are a lot of broken tines, and that spotter can save me a long walk to a broken bull as an example.
My optics currently consist of Maven B3 8x30 binos, Leica Geovid HD-B 10x42's, and the ones mentioned above. I do not currently bow hunt, just muzzle loader and rifle.
Scouting trips I'm generally taking the Mavens 8x, Swaro 15x, and the spotter. 8x around my neck, the others in the pack. I don't need the rangefinding binos for this.
Hunting elk, caribou, moose, antelope I'm generally taking the Leica 10x and the spotter. I don't need the 15x to locate these animals most times. My 10x are capable of locating, my spotter for evaluating. There are exceptions but this is what I do more often than not.
Deer I'm almost always taking the 10x Leica, 15x Swaro, and the spotter. I'll be glassing enough with the binos on the tripod to justify the weight.
My interest in going to the Swaro instead of my Kowa is primarily the larger field of view. I hope that it will be better for scanning, locating game than the Kowa for me. It may or may not be enough different to change my current system for some hunts.
Hope that makes sense and helps.