Mine was also in a greenguard when the laminitis started. He was in a very grassy 20 acre field/woods with 3 other horses for 12-18 hours a day depending if he decided to come to the gate at dinner time. Ideal turnout for those that aren’t easy keepers .
GG does make a “diet insert” now though which I have on hand. We were at a “camp” type weekend and they did offer turnout but it was on grass and I used it then. Otherwise for normal turnout on hay, I just use the standard.