I am not familiar with the Helius Router, but a quick search indicates it is a directway broadcaster. A one to many stream feed.
In any case if you want a content manager/blocker and have a choke point (i.e. one point of access to the internet) and this router appears to be it. Setup a doublehomed Linux box betwen the internet and router. Run any of the several good filters available from open source. IPCop as an example.
Or buy a small appliance which comes setup and does the same thing and usually with the same software.
Point being – if you don’t know for absolutely certain the internals (hardware and software) of yout router and the company does not have or plan to have the functions you want. Any attemp to modify the current operation can leave you with an expensive lump and NO warranty.
How much downtime can your company afford if an attempted mod to the router shuts you down.