First off, if they are concerned with you playing sports without the brace they should be concerned with you performing plyometrics, unless their only concern is you receiving a direct blow to your knee. My guess is that's not the case and they are worried about the twisting action and increased likely hood of hyper extension because of the still recovering tendon and ligament. Also my concern is not with your muscle strength, rather it is with the tendons and ligaments, the parts that were damaged. Efficient (useful) Plyo is going to take the tendon to its limits which puts you at a higher risk of reinjury. Muscle grow/get stronger faster than the tendons and ligaments, just because the muscle is ready to go doesn't mean the tendons and ligaments are. With the muscle already being fully developed and the tendon and ligament not it is just an increased chance of injury.
Secondly, the amount of volume per workout and the frequency of training, 2 plyo + 1 strength + 1 day of sport in 5 days is a lot on a still recovering organ. You wont recovery properly and you gains will be less than optimal over the long haul.
I wouldn't advise plyo training to a fully healthy person that hasn't been strength training or involved with a sport (non skill related training during practice) for 3-6 months, never mind one that had major knee surgery.
I understand your desire to get back into the game as soon as you can and you are willing to give it your all to do so, but it doesn't mean you have to move to full blow advanced training techniques right away. Start with something that incorporates strength training and a little bit of plyo work.
This is coming from someone who has gone through knee surgery and after 9 months of recovery time with a Physio/Physical Therapist still reinjured it because I started to get impatient.
Muscle grow/get stronger faster than the tendons and ligaments, just because the muscle is ready to go doesn't mean the tendons and ligaments are.
Really take a look into something like this:
If you are unsure if you are ready for it take a copy to your PT and see if he thinks you could handle this work load. I just know that my surgeon was a moron when it came to training and didnt think squating, or even bent over rows were a good exercise because there is too much risk for injury. He suggested all I should do for a good workout is curls, calf raises, and bench press. The rest of the stuff was too dangerous. Docs dont know everything.