I would have thought it would be possible to arrange something.
At my place we have visitors passes - big form to fill out, photographic ID, form countersigned by the 'sponsoring' department and Aviation Security and then visitor must stay with a full pass holder at all times.
Visitor goes through the staff search point and is subject to a full frisk regardless of what the arch says! Pass can normally be issued within about 10 mins
I would ask BHX Airport Ops if I was you.