https://github.com/hagbard-01/vyos-1x/blob/current/src/op_mode/conntrack-sync-status.py

Please have a look, I changed some logic compared to the original perl script. I read the real set values, while many are set in the perl script itself. The interface definition and everything else is still pending. My ideas was to have the op stuff implemented first and put in place, since the cfg stuff is separate anyway.
Just copy the script into the vyos home directory and call it from there before it makes its way into the vyos-1x package.
I would really appreciate if anyone with a life config could test it, I just configured 2 VMs and test it.