First I would think that you can get a drop in .40 barrel, the mags should be the same, if you want to play with a cheaper round.

Second, "only two hands".
EDC (usually 2 similar ones in case of work needing to be done), small pocket carry for super concealment, USPSA guns for at least 2 divisions, everyone needs at least one revolver, everyone needs at least one .22, and most important everone needs a 1911.

You can rationalize almost anything.