Maybe have a policy that if you want to represent the school at a high-profile tourney you have have to be part of the A-Team of your school. To be part of of the A-Team you have to qualify in an inter-school competition where aggression will be a strong quality.
That "stay in the circle until you win" drill seems appropriate.
and the keep rolling vs fresh oponnents dont give up damm it!! would also be excellent
A motivated student is willing to push himself greatly, there are people willing to take this and far more for example
You train intensity.
Gauntlet works for pretty much everything.
One person in the middle and every body else helping out. So imagine a big line of people picking on one guy
1 minute you take them down resisted.
1 minute they take you down resisted.
1 minute off the wall them taking you down.
1 minute you taking them down.
1 minute unresisted takedowns.
Or something like that mix and match depending on what you do for comeptition or what strengths you want to work on.
Or fighters will do 15 minutes above is generally the first set. Then you might do a ground work set escape guard,escape mount, or pummeling for underhooks or something like that
And it is done flat knacker. Person in the middle falls down then he gets dragged back up untill he either times out or dies.
By the way I would start with three minutes if I was you. It is pretty tough.
Also you could take some russian ideas
Dont Hate on Human Weapon and Fight Quest because of them I'm doing Kyokushin and Muay Thai