Thanks. This morning, I used a bit more force with my fingernails, and was able to get the Rings to un-clip from the ridges on the Backshells.
It appears that, on the Qian39, when looking at the back of the drivers, with the notch at the top -
1.) Left driver has Red marking on the Left side
2.) Right driver has Red marking on the Right side
I've cut the 6-meter length of upgrade wire that I ordered, into four 1.5-meter pieces.
Now, I need to braid/twist them into a new cable assembly, solder it to the drivers & one of the Ranko 2.5mm TRRS plugs, and reassemble the earbuds.