We do this quite often. The recipe is simple:
Do all our typical upgrades, then we shorten the CGW firing pin to 2.440, and install our HS-18 hammer spring. This way you still have the short reset, superb SA break, but the DA goes from 7.5 lbs. (with our HS-13 hammer spring) to around 8.5 lbs. with the HS-18.
We have had no complaints from customers with this set up and you can run either the 9 mm or Kadet as you normally would.