There are two parts.
Firstly, this would require royal recommendation, as it's a new role that would have to be funded. Aside from that, there is already a system in place whereby an amicus curiae can be appointed, a system by which judges can get that extra opinion that isn't necessarily being presented before them. An amicus curiae can be appointed, and it is part of a judge's role to undertake any special considerations.
We would submit that this is not necessary.