You might want to take a look at W. Hock Hockheim’s Close Quater Combat - it deals with unarmed, stick, knife and gun combatives, as well as unarmed response to armed attacks, etc. Its very simple, gross motor skills stuff generally, and takes a lot of stick and knife stuff from Filipino MA. He has apparantly trained a lot of cops and special ops military in this stuff. His head-of-school in Australia, Glenn Zwiers, is a hell of a martial artist, and a good guy…but i cant speak for Hock himself.
If you learn to do what Glenn can, you’ll be able to handle yourself, and then some…
…but i have to put in a caveat i heard from the first guy to teach me knife disarms;
“Knife fighting is like high-diving - once you take that step, you’re committed, and your going to get wet.”
After doing a bit of this sort of stuff, i have NO interest in carrying a knife for self-defense purposes.
If you do train some of this stuff, you’ll almost certainly do the Magic Marker Drill. After you’ve learned a couple of disarms, and you’re feeling pretty good about your bad-ass-ability, put down the rubber knife, and put on a white t-shirt; have your training partner do the same. Randori (that is, do some loose, dirty sparring) using some magic markers as knives - try to cut and disarm eachother with the markers. Then check out all the places you got “cut”…its humbling, to say the least. You might also try it with different color pens for you and your partner - you’ll be surprised how often you’ll cut yourself, especially if you wind up grappling.
IMHO, if i was the type to carry a weapon, it’d be a collapsable baton type dealie, especially if i was an arnisador/escrimador (student of the filipino arts). Knives are messy, they bite back, and once the integrity of your skin get compromised, its really hard to make all the stuff that falls out, go back in.