Oliver/Roger
I don't hate myself exactly. Just wish that it hadn't come down to the price of having an opinion to be so dear.
Disillusioning charms? On an overcast day, they're as good as invisibility. And you and I are both larger blokes. We could counterweight a passenger quite easily, and we're used to flying in all sorts of conditions. I'd say it's about the same time as a ferry, since we're open to the elements and all that.
This is just a pipe dream though. It's not like the Muggleborns on the run are hiding in plain sight.