Why unscrew the coupler instead of just releasing the Bowden from the coupler? For one, the couplers generally suck, and I have had more than one that held onto a Bowden tube and would not release or not without difficulty. The other reason is that eventually the tube will get chewed up if it is removed too often.
To design this reminx, I used the "Creality CR-10S Ultimate Filament Run Out censor With Z Axis Cable Guide" by 3Deddy at Thingiverse, along with my Bowden coupler. My plan is to use it with my CR10S Pro which I believe uses the same filament sensor as the CR10S (but I have to verify this when I get some time and my printer is free). It looks like Creality uses the same sensor for different printers so I expect it will work fine, and if not I can modify it to work. I have printed a version of this, and then went back and optimized it a bit to use fewer supports (but there will still be supports needed). This version will be mountable on a 2020 extrusion using some M3x25mm cap head screws. If it works I will post it at either Thingiverse or Printables.
Updated 9/14/2022 to remove "PC4-01" and add the correct type of coupler, which is "PC4-M10" (with a link to a product).