I have a Marauder I decided to play with like you are wanting to do. I started by replacing the whole fire control with EGW, CK Arms SS grip, drilled and tapped the frame for a CK arms DP Pro red dot mount, DP-pro red dot, Wilson Combat multi comp.. I took and really lapped in the fit of the slide to the frame for fit. Each step took a little bit of work and fun time but it made a sweet shooting gun for 9mm minor. The dot has very little movement!
This isn't for everyone but while costly it was fun for a retired guy and shows what can really be accomplished.