I've seen people who want a .25 ACP carbine so they can make accurate reloads and have a small caliber, small game rifle, but the thing is that the .32 S&W Long or H&R Magnum loaded with Trail Boss is much more practical and slightly more powerful than a .22 hyper velocity is... and they already make .32 rifles.
The thing with the .31 calibers is that the .36 calibers can do the same thing the .31's can and better. A .36 round ball coming out of a 12 inch barrel would be more than sufficient for small game and it wouldn't be prohibitively destructive like a .44 would and there are a lot more options out there for .36 in both guns and bullets. The .31's are limited to round balls and that's it.
BTW, spur triggers are notably bad when it comes to precision, it's better to have something like an 1851 or 1862 Navy, but I understand you probably like the sight picture of the Remington style revolvers. Given how long the barrel would be for an 1851/1862 Navy, you could mount a rear sight on the barrel and still have a sufficiently long, and better, sight picture.