RE: which .22 compact??
Just an idea but what would be wrong with a small framed .22 revolver such as a S&W "kit gun" with adjustable sights? With a revolver you can shoot the shotshells and conventional bullet loads interchangeably. You can also shoot full power and quieter CB caps in the same cylinder. I think S&W even makes a very lightweight model in alloy frame or even scandium. Taurus also makes several models of revolvers to choose from.