Quote from slo-rider on Jan 22^nd, 2021, 11:36am:

 
There wouldn't be a problem removing the grip shifters. The cable housings may be too short to install bar ends after removal of the grip shifters. It would be no problem to extend the housings with new short pieces of housing, using these: https://www.ebay.com/itm/New-Jagwire-4mm-Double-Ended-Connecting-Junction-Ferrule-Bag-of-10/283204204865?epid=1100104289&hash=item41f0493941:g1kAAOSw2BFdUd~u. You would need to install new cables.
 
Here's a good video that shows how to install bar end shifters: https://www.youtube.com/watch?v=6vbZhVI6_bI. Shimano and Microshift bar ends are not compatible with your bike's SRAM GX rear derailleur, so you will need to install SRAM TT 900 bar ends. The GX derailleur doesn't have a cable adjusting feature, so you will need to install an in-line adjuster (https://www.ebay.com/itm/Jagwire-Mini-Black-Inline-Adjusters-for-Shifter-Cables- 1-Pair-New/113840128630?hash=item1a81668276:g:-q4AAOSwOzJdQ-k-). Note that the expanding plug on the end of TT 900 bar ends is secured by turning the internal Allen head screw clockwise.
 
If you find bar ends don't work for you, you might want to try SRAM GX trigger shifters. I've used trigger shifters for many years on my bikes that had/have Superman bars. I installed inexpensive, wide handlebars (RANS B-41) on the bikes to keep the shifters from contacting my legs. I much preferred triggers over bar ends on my high racers and other bikes.  

Thanks for the helpful info.  The trigger shifter sounds much better for the CA 3.0 handlebars.  And less expensive too. And simple enough I could install it myself. 
The way my seat reclines, I need all the handlebar length I can get, so I probably won't trim the ends.