Wyze cams now have an RTSP firmware as well and cost about $25 for stationary, and $40 for PTZ.
[0] https://www.theverge.com/2019/12/30/21042974/wyze-server-bre...
At $25 to replace, it's probably worth risking bricking it to try out alternative firmware: https://github.com/openipcamera/openipc-firmware