OMG, you still wouldn't need to double the clutch, only rev match.... theres a difference.
double clutch if you are changing gears under normal driving conditions, since the revs fall quickly.
if this was the case by the time you'd matched your revs and got your foot onto the clutch the revs would have droped again. The techniqure your thinking of is rev matching, which is what heel and toe is.

I will concor that doubling the clutch is rev matching however, the only reason rev matching must be done is because by the time your ready to put it into gear the revs have droped below the match point, a decent trucky wouldn't even need to touch the throttle during the process.