Don't be afraid of the rj11
Here are some parts that make it possible to work around the rj11.
I linked Walmart, you can get these from amazon, ebay etc.
https://www.walmart.com/ip/Unique-Ba...aptor/47551182
https://www.walmart.com/ip/6P4C-RJ11...White/47593244
PLEASE NOTE when purchasing rj11 products ALWAYS make sure there are 4 conductors, spade tips, etc.
Plug your rj11 sticking out of the wall into the coupler then the rj11 from the spade-lug into the coupler then carefully stick the coupler in the wall, being
carefull not to drop the spade tips oppss.
Now your ready to attach to your "new" thermostat when you find one.