The 4" Kimbers are bull barrel/bushingless, so you'd have to find and fit a bushingless barrel.
Kimber used to make an all steel Pro Carry II HD which would eliminate alloy frame concerns, I haven't checked to see if they still have it.
I have both a steel frame Pro Carry II HD and an alloy frame kimber Super Carry Pro in 45 acp (no feed problems!). The heavier pistol is noticeably easier to shoot well. If I wanted to get multiple accurate shots on a target relatively quickly an alloy frame 45 super 1911 would not be my choice.
