That's one of the more sensible suggestions I've seen in this thread so far Alistair!
As for comments about mirrors, people forget that to meet C&U* regs mirrors have to meet a certain minimum size - the round ones do not do so, so cannot be supplied as OE fit. As someone else has already posted, a simple mod will allow some extra movement in the nearside mirror.
(*Construction and Use)
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '09 Gen2 MINI Cooper ragtop '90 LR 90 SW