Lord Steve - nice one.
I looked at some exotic rentals to pick-up in Paris for 4 days. The cheapest GT was about 3 1/2 K (Euros) per day with a 75K deductible, so your 3 hundo in gas money looks quite nice about now.
Is he a good enough friend/customer that if the unthinkable happens, he'll still be either?

Looking forward to your post-trip write-up and pics, of course!