I know the answer to this question may be largely dependent on personal taste & preference, but --
I am now the proud owner of a new Randonee, with help from the REI 20% sale. I can't put a bar-end mirror on this now because of the bar-cons, and I feel naked without a mirror. I'm not a huge fan of the other options (helmet & eyeglass mirrors, because they are awkward & can be shaky, or the bigger bar-mounted mirrors because they look like they stop a lot of wind).
I am thinking of moving the left shifter from the bar-end to the down tube, and mounting a bar-end mirror because they're convenient, dependable, and fairly aero.
What do you think? Is this a pretty practical choice? If I do this, anything I need to know about the minor surgery involved? I haven't really messed with bike components in a couple decades.