I had an error while making this I remember, so one of the notations is wrong, also all the movie names I got from the command list of the game itself.
It's kinda tough to explain, I kinda just got good at it thanks to 3rd Strike Confirming. You do the final cr.lk with a Quarter Circle input, that way you only need to do one more Quarter circle to pull off the super
The trick I found was to try to buffer it while doing the light kicks, so in the second cr.lk you do a quarter circle(I do a QCF, and before I reach the forward input, I hit lk when it's in downfoward), and if you see it hitting, you finish it by doing a final QCF and just hit the button to activate the super. so yeah you had the right idea. Kinda hard to explain but yeah you're supposed to buffer supers while doing the kicks.
Figured it out, was letting go of lk during the 236 motions and getting negative edge. Holding them while doing the input makes this surprisingly easy. Many thanks.