[Bryce2471]

Originally Posted by JorgeReyes

But splitting the ball shifter gears or trying to put it in front or behind the inital reduction like dog shifters would require a custom ball shifter wouldn't it? If you split them you need to have to ball shifter holes farther apart which would mean maching a custom ball shifter housing and moving it in front or behind would mean machining a longer or shorter ball shifter rod.

I might just go with a dog shifter for ease of manufacturing.

Going with a dog shifter, is not a bad choice. But with a little design work, you should be able to use the cots ball shifter shaft. You would definitely have to make custom plates though.
If I were you, I would consider hanging the CIMs over the drive rail, and putting the cluster gear above your chain drive. (Or belts, if you prefer)