That's a real reach.

Good luck with finding a 4-way stick that will turn smoothly enough to work decently as a spinner knob.
IF you find one and
IF you have enough depth under the panel, you might be able to couple the joystick to the spinner using a shaft coupler.

You may also be able to fabricate an arm and post setup like the one that keeps the body of the rotary switch from turning freely on a Happ Rotary Joystick. (P/Ns 96-1011-00 and 95-2507-00 below)

Scott
EDIT: On second thought, you might be able to adjust the microswitch arms or shave down the actuator (96-1012-00 -- only $2
here from Happ) on the Happ Optical Rotary stick to make it into a 4-way stick.
Anyone know if the Happ Optical Stick
has clicks or if it turns smoothly? Confirmed as smooth turning
here.
(IIRC the
Loop-24 optical rotary stick has clicks)
EDIT2: Instead of bending switch arms or shaving the actuator, you might be able to cut off the 8-way end on the Rotary stick actuator and do the same on a Happ Super 4-way/8-way actuator so you can use the 4-way end of the Happ Super actuator on the Rotary.
Confirmed the same diameter shaft on both sticks. (The Rotary is basically a modded Super.)