Wellllll... There are 2 schools of thought as you say. For piece of mind I'd get the fuel system completely drained before it fewks it - if I could afford to. Realistically, I'd run it, topping up with Diesel every day until it was no more than trace. The good news is that if the engine didn't sieze on the way home that's a good start (petrol won't compress like Diesel so it locks the pistons solid in the cylinders). The bad news is that the petrol and Diesel will separate in the tank overnight and the petrol will lie on top of the Diesel, so running the tank low will increase your chances of failure.
I honestly don't know what I'd do, but I'd be shi**ing bricks too. At least for awhile.