In cases like this I prefer the zener current limmited with the 4k7 directing over voltage to gnd insted of the regulated VCC. Either will work but with going to VCC it may affect V-Reg..
The 0.1u cap is only leveling out the signal (appears to be a standard solution on this bridge) and the 4k3 is still doing it's job of I to V.
Since you're testing the hardware we will of course take the tested version.
cheers.