Not sure about any such products. Mainly because most home use routers are very limited with respect to such controls.
DD-WRT and Tomato are firmware programs that can be installed on many make and model routers. Perhaps one of those programs may provide the granular control needed. Main risk is that the firmware installation process can "brick" the router to the point of uselessness. Overall, the installation process must be done with planning and care. Perhaps another forum member can address any connect/dis-connect options within DD-WRT or Tomato.
The last "solution" that I was addressing involved using PowerShell and remote access to stop and start a process on the targeted computer.
However going a step further, I can...