I've found sled work to be phenomenal for this. Walking forwards and backwards. These folks cannot help but activate the VMO with the backwards walking and everything is firing in synchrony. If you can find a sturdy plastic mop-bucket at Pro load it with a bunch of weight and rig up a pulling strap. Charles Poliquin did an article for BFS year or two ago using sled work and Peterson Step-ups:
you might want to track that down. I highly recommend Poliquins material...many people slam his work but the dude is legit.
From there itís the standard squat, DL ROM work.