I use these as well.I have a set of mirrors that go into the hinge when I have the doors off and not running tube doors.
Olympic 4X4 Products 117-124 Safari Mirror, Textured Black
This is exactly what I use. Inexpensive and easy to install. The only thing is making sure they are screwed down tight so they don't swing back in the wind. Yes there is vibration but it still makes it legal.
Actually this is false. These are on my wish list as soon as I have the spare change...Same here. A cheap set of mirrors off the door hinges. It takes maybe 5 minutes to put them on.
I've looked for a more permanent answer to the mirrors issue but if you have heated electric mirrors and don't want to lose those features then there really are no options other than temporary mirrors as the doors come off.