One thing that i found works really well is drilling Wrestling outside class time
(Before/after class or open mat)
Just drill the entries. For an instance, pummel 3 times then entry to a greco roman throw. Or drill single/dbl legs constantly without taking you partner down.
It's not the same but its the best option when the mats are full...
Yeah. I love open mat!
it's great for drilling wrestling, ground techniques
Or just rolling from stand up.
Or drilling self defense techniques