All remote control and monitoring options for RUT950 are described here. But to sum up, you need remote CLI access, so your options are:
- Public IP
- Access to a VPN server for both your PC and router
- RMS
You said you don't have a public IP and RMS CLI isn't working out for you, so basically only the second option remains. I suggest either looking into VPN service providers or wait for a response from our RnD on whether they can add a scalable timeout and long it would take.
Also, they say that they will be extending the timeout in November, so that may be worth considering.