Skip unnecessary step in signup process with protected content

So following a thread with Sajid, please find below the issue I am facing.
I have broken down the sign-up process (from pricing table to payment) here : https://www.dropbox.com/s/fteivsggrpra4af/skip_step4.pdf?dl=0
Do you know how I can skip step 4 ? as user has already chosen the membership he wants, so it is unnecessary to show him again the different memberships available.
Thanks a lot for your help,
Thomas