yeah.. when you miniaturize a 1911 it gets complex.. . in my opinion the 4" is about the least they can go with the original design. the inner and outer springs are there because of what you say and no way around it. good news is that they stay good for a very long time. They also cancel the harmonics of each other.. think of the dual valve springs (inner and outer) of the hot rod motors..
you should be able to do a sorta press check thingie with the slide to hold it back to get the slide stop back in... pretty foggy for me cause I only seen one other one and it was not a genuine Colt. Look on Youtube.