Yeah, I'd love to see someone like CZ, EAA, or even Glock make a modern gun chambered in 7.62x25, but I figure that'll happen at about the same time you can buy an ice cream cone in Hell.
Seems that the next best possibility would be to have a custom job done. As for why, well, the 7.62 is a screamer of a round. Plinking targets at 100 yards with a pistol is a heckuva lot of fun (and something that far too many people think is impossible.)
As for Tok vs. 357 SIG, it seems that the fastest velocity (after a quick web search) is around 1400 fps, +-. The Tok is just getting started there. The round can be (so I'm told) safely loaded to get velocities nearing 1900 fps, and if you want to go even faster, there's always .223 Timbs...
I know that all of this can be done with the CZ52, but that pistol leaves a lot wanting. The entire paradigm of design behind it is based in Eastern bloc Cold War-era engineering. We've come quite a ways since then, most notably by coming up with the concepts of ergonomics and human engineering. High-profile sights, comfortable grips, and easy to use controls are in rather short supply on the CZ52 and TT33.
Plus, one would assume that modifying something like a BHP would result in higher mag capacity because you're going from a single stack to a double stack magazine.
It's the latest rage, why have a .44 Magnum that's got ammo available at every discount store when someone can sell you a 460 Rowland!
Because with the advent of online shopping, I no longer need to go to a discount store for ammo, but can instead order up a case or three of whatever I want without even getting up from my chair.
Besides, there's tons of surplus Tok out there, and man is that stuff ever cheap!