Ian also makes a double edged version of the Disciple, if that's a legal option for you:
It's a really good knife. Get a purpose built sheath for your needs and your gtg.
For a trainer, I would get on bladeforums and post up to the makers there what you are looking for. Someone will likely be happy to help you. I'd suggest getting it made from G-10. It's nicer for your training partners and you can just get the whole thing made out of a bright training color.
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Very intriguing, each made with input from two familiar names:
http://jerkingthetrigger.com/2015/06...watson-knives/
The push dagger designed reminds me of the SureFire ED-14, which sadly is no longer made along with the rest of SureFire's edged weapons.
You don't gotta love it. You just gotta do it.
Joe is good people!
Both of those are on my 'to buy' list when they come out.
I have quite a few of Joe Watson's knives (recently acquired a different karambit of his and it is very nice) and they're all top class.
One of his designs that is a bit more 'general purpose' and small is the Magni, I'd pick it over a Street Beat any time.