Here in the US, I have not had any issues getting my 712W and 710M fully insured by State Farm with two agents in different states. In fact, my current agent said they could possibly help since I had them specifically check and they said there is no specific issue insuring Pinzgauers.
Check with a different State Farm agent, and (if needed) threaten your current agent with moving your policies to an agent who will work FOR you, not against you. The agents get paid by the policies they carry, so your agent has a financial reason to help you get your Pinz insured compared to loosing all your policies to someone else.
Good luck,
Jim M.