Sorry am I being dim? how can you double de-clutch without using the clutch?
Do you mean rev matching (heel & toeing)?
Isn't double de-clutch...
1) clutch in, remove from gear
2) clutch out, blip of throttle
3)clutch back in, into next gear, clutch out
Rev matching (heel & toe)...
1) Clutch in, remove from gear
2) blip throttle
3) into gear, clutch out.
or revmatching without clutch where you do the same as rev matching without using any clutch (do-able but not advised!)