Here's a decent realistic approach.
That was pretty good. It's a tough game to play, (to try and train for it). Time is so critical to your chances in a real scenario. I'm convinced you need a mask too, cause to practice properly, you need the freedom for everything to be a target. Head, face, neck, body, arms, legs, hands, fingers, anything you can capitalize on.
We used to use these things:
Noticed how the guy with the knife in the vid switched hands when his knife got caught?
Back in the day I noticed there was distinct difference in the reaction of someone wielding the attacking knife when caught depending on whether thumbs were used. So, (I'm not advocating kung-fu, just using the only pics I could find quickly) If you grabbed their wrist with a thumb grip they knife guy would try and switch to the other hand, pretty quick.
But, and this is a terrible picture, (nerds), if you kept your thumbs off the grip and finger palm held it like a sasquatch hand with no thumbs the knife guy would struggle against it, (thinking he could beat it without trying to switch to the other hand) It was precious time to punch him in the face. It clearly bought time almost every time. And most times it got his attention trying to beat what you were doing, instead of you trying to catch his knife!
Again its a (sometimes fun) but time consuming game to get good at with no real expectation that its going to save you without a shitload of "ifs" thrown into a given scenario. (Not saying its not good, just no guarantee) We fucked up our nice expensive fencing masks cold cocking each other, Cheese gated each others faces a few times, had cracked bones in fingers from those fucking rubber knives. You can fuck somebody's hand up bigtime with those things ha! a real knife would just remove fingers like a ginsu through celery sticks.
We never got to wrestling on the ground though, we always ended up doing this in parking lots and alleyways. I had 3 years of pretty good epee experience with drills and drills: people trying to hit and catch my hand, so many times I got to be the thug attacker. The other guys I practiced with were belligerents, which helped me cause you shouldn't get too used to clean angles; awkward shit was good. A good pool of different personality types is really helpful too. We only had 4 guys and pretty soon everyone picked up on each other, and then everyone starts to plateau, (not to mention the busted up fingers).
It's a very psychological game, I've seen guys, (these weren't professional fighters) with boxing, kickboxing, and other skills get so caught up in chasing the knife that they lost their ability to bring useful things they knew to bare in practice. Interesting stuff.
Vid got me to thinking about it all again, just babbling on, reminiscing. Carry on.