Conversion is not an option, the only 45 that I have is highly customized commander that I don't want to touch, I also have an SVI in .40 (USPSA dedicated), an STI in .38 super (IDPA gun), a CZ RAMI in .40, an STI VIP in .40 and Keltec P3-AT in .380.
I am ok with buying a dedicated gun for the purpose, but it is not something that is going to be carried a lot, so I am not worried about the weight, with a good holster it just adds to the workout.
The fact that I don't own any revolver adds to the equation.