I've always wanted to do this, but not eating for 3+ hours after waking is just too damn hard. Not only from a hunger standpoint due to the GHRP-6, but also trying to jam in my daily cals in a shorter period of time. I eat every 2 hours as it is just to get all the cals I need in a day.
Yeah its really difficult for me to do also. It does help a lot to use either GHRP-2 or Ipamorelin instead of 6 as those two peps seem to induce far less hunger in the vast majority of users.