Learn to keep stroking
Got it? Good, this is called Backhand Masturbation, now switch back to normal.
Did you notice what you just did? You had to stop for a second to change the method, you can use that to your advantage. You are still stroking at standby speed i hope?
Now slide your hand off your cock in one smooth motion, flip your Hand and let it glide over your cock again and continue with standby speed stroking. You have to make it look good when you switch the method, and by doing it so it gives you a few seconds to cool down.
So you actually stopped stroking without looking dumb, because you were 'just' switching the method, to please your viewers in another way.
Try it a few times, switch method slowly to get short rests. When you got the hang of it ...