Is there a way to adjust the location of the joystick's uppermost position. As you can see, you can't get full vertical travel in the picture because the joystick would hit the forend. If there is no adjustment, a downward curved handle should work nicely.
I got an older Farely. never saw one like that.
The handles have a dog leg in them. Find a pipe fitter or Electrician. They will have a pipe/tubing bender to install a dog leg...........
A higher rear bag would not help. The joystick is less than a foot long, and the knob extends about two inches above the front bag. If there is no adjustment built into the rest, a dog leg bend should work fine.