He hired and is paying for his own attorney and now he wants to use his insurance company's attorney instead.
Sure enough as strange as it seems that what he is reporting. But the cooperation and assistance clause still looms as a significant factor.
If he is prosecuting a tort claim independently of the carrier from which he has received compensation in regard to the same claim, he could be jeopardizing the carrier's subrogation rights thus voiding the policy and be liable to make restitution.
If he is defending a tort claim covered by liability insurance, then he is duty bound under the cooperation clause to
"participate in the preparation and trial of the case in the manner requested by the insurer." * And they are not about to let him turn back the clock!
Anyway it seems that the OP has more money than he has time to elaborate.
[*] Case citations available on request.
[SUP](If I feel like it)[/SUP]