I have also been thinking of doing this as well as my thermo/hydro sensor isn’t the best on sensitivity to temperature but then again, I don’t have the latest sensor in there as mine is from 2012.
I am not sure if you can change it over so the probe is being uploaded along side the other data as it depends on what software is used and how it’s designed. As I use Cumulus, I don’t think you can have the temperature reading from another transmitter reading as the main as it goes by the full ISS. This also would be good if Davis had an extra port for humidity on the SIM so you’d have WIND SUN UV RAIN TEMP HUM. As then it’ll be possible.
But yes I am also willing to hear if others have done it, I haven’t tried it as I don’t have another transmitter for temp only