Foot On Hip Variation - Stretch him away with your legs, push his head, opposite foot on the ground and shrimp away, foot on his hip and stand up in base. This has the advantage of pushing him back with your foot.
Note: If he is committed to hugging your waist when you push the face you can insert some elbow strikes here to loosen him up and create space.
Pedal Kick Variation: Stretch him away with your legs, push his head, opposite foot on the ground and shrimp away, foot on his hip, you are in a "L" position and extend that L to an "I". Recoil the leg you pushed off on the floor on and stomp kick his face. Rock yourself up to a seated position and push his head as you stand up in base. (If he grabs your leg at this point, stuff his head, turn your body away, and pull it out and run away)
Jiu Jitsu Drill: “Get up sparring” - Practice both variations of the guard get up against increasing degrees of resistance – gradually increase the level of intensity until your reach failure but remember, if he holds tight his arms are occupied and he cannot defend your strikes.