Geko did a great Wifi integration (that does not need the Zwave Usnap). It was ero4444-proof. I applied it to my CT80 but it is made for your 3M-50.
It helps if you already have the 3M-50 talking on your LAN (that’s a bi-- uh bear), which is probably easier if you have an iPhone / iPad to setup the Tstat.
Please note, Radio Thermostat moved to a new Github repository: