Cudy WR1300v3 differs very little from v2, so I made a new .dts to support it. It is already supported in snapshot versions (main development branch).
I also submitted a PR to support it in 23.05.x but it hasn't been approved yet - maybe someone can take a look at #14430 and accept it.
In the topic you linked I also made an unofficial build that is 100% compatible with 23.05.2 including the kernel version and works fine on the v3 hardware.