The backup to my 1911 (or HiPower) is a Kahr PM9 Covert.
It may not be the most 1911-like gun, but isn't that far off either. It has more in common with a 1911 than the typical J-frame BUG.
The grip angle feels similar to me, and the Kahr and HiPower grips feel more alike than their size difference might make them appear.
Since I dont operate in a LE capacity I only carry 1 gun. But then I am also the guy who thinks he can get the job done with 1 magazine. For IDPA I will have to learn those reloads if I can ever get a day off work to go give it a shot.
I don't normally carry a BUG, but I have gone to areas where I felt better about having something extra just in case. In those cases I carried my SP101 in an Uncle Mikes Sidekick along with my primary IWB.