To be honest, the way you have yours setup now is safer. The fireplace can not be turned on programmatically unless the analog switch is on. However, the fireplace can not be turned on without the relay saying so. That’s double security and you can kill the fire either through ST or the analog switch.
I went a different route. I used the “Fan” switch to power the relay to the gas valve. I was able to put a SmartSwitch on the fan that feeds an outlet inside the fireplace that the fan is plugged into. Using the same plug, I powered the relay that turns on/off the fireplace. Can also turn on/off via the analog switch. However, if turned on via the analog switch, I can’t turn it off programmatically.
I could easily eliminate that analog switch but like having the ability to still light the fireplace in case of full power failure.