Its a great glitch but its very difficult to do.

Do the SP-MP glitch but instead of leaving the session go into creator mode and load a creation that you already made before and hit test you get put into a match and you will have an invincibility menu and everything

Note: Doing the sp glitch and trying to load a creation whilst lagswitching and avoiding being put into a freemode game before you press test is very difficult. If you join a game (weather and time switches) and then you press test then your game will freeze and require a dashboard (Happened to me at least 50 times)