First don’t be too hard on yourself. Think of the split legs as an option, the full split is just one thing you can do with the legs in while using a back/rear arm pit grip! If it’s intentional v is just another variation. Other leg positions you could try are attitude legs, straight legs (aka rocketman) or a zigzag shape with the legs, with feet pointing to the floor, knees bent.
There’s really no option I can think of that will look like a split other than a split when in the air in a back armpit grip. You can fake a split on the ground but unless you are allowed to grab the leg there’s not a trick I know of to look like a split. Maybe someone else will have a better idea!
Working on the deep glute muscles will really wake up that active split so keep that in mind as you practice in the future.