Doubt if you will get any further joy with a specialist.
I was knocked off on Dec 1st last year, (broken bones, cracked ribs, trashed shoulder, and bike) the driver admitted liability and I have so far only seen some money for some damaged clothes (took longer than 3 months to get this even). This is with one of the specialists.
Best bet is buy a bike on credit and it sort out when the payment does eventually come through.
The insurers are buggers for dragging their feet.