Sledgehammers and nuts?
I don't think so.
In this particular instance, the airspace is predominantly used by either the miliatry or north sea rig support traffic, very little G/A activity takes place. consequently, each day, each operator will make sure that their requirements are pre noted, and hopefully everyone will know about each other in an area of airspace which at the best of times is known for poor radar coverage at low levels.
The reason that we, and the majority of radar service providers are not allowed to give a service using SSR only is because of the risk of someone coming the other way not using their transponder, (very, very common!) or not having one at all, and the aircraft not painting as a primary radar return.
If anyone would like to come and visit my unit too see what I mean, I would be delighted to accomodate you.
PM me.