As far as 9x23 being hard on the gun, the brass is ungodly stromg, which is why you have to use SMALL RIFLE PRIMERS with the loads. Pistol primers will fail long before the brass will, so the stress on the chamber is probably not any worse than usual. With my EAA 38 Super Match, I just threw a Wolff 22# recoil spring in the gun and it runs fine, and the brass doesn't eject abnormally far, which IS the sign of an undersprung gun.
And considering that these CDNN Tauruses have to be recent production, it's a good bet that the chamber dimensions are set up for fully rimless cartridges. All you need is a recoil spring that is 4# - 6# heavier for 9x23, providing Taurus didn't cheap out on the construction like they sometimes have in the past.