Your bike has a bridged handlebar mount similar to this:
View attachment 54902
If you insist on using a steering stem-mounted holder, then you would need to replace the bridged mount with unbridged mounts, like this:
View attachment 54903
The trick will be figuring out which ones will fit your top clamp. Personally, I think you're better off using a different mount if you want less hassle and a quicker installation. Something like a RAM 7/8" handlebar mounting ball that could go anywhere along your handlebar:
View attachment 54904
Or something like this that can be mounted anywhere:
View attachment 54905