This would be great if we could CC in Hawaii. Unfortunately, we can't, which therefore makes ECQC kind of pointless; unless, of course, you are military, which in that case would make sense.
Might as well join a dedicated self-defense school and practice CQC there.
The ability to access and draw a tool or weapon is fairly the same whether it is a pistol, flashlight, baton or knife. I acknowledge not all are legal to be carried in Hawaii, but it is still a skill that should be practiced. Statistically assaults are up close and personal. This reinforces the position that accessing and drawing skills should be practiced in conjunction with a use of force continuum.
Does anyone have any suggestions where someone could practice these skills?
Anyone feel free to pm me a suggestion or if they'd like to teach aor train with me.
If you are going to imply 'knife tactics', please state so. Being that this is a 2A site, people usually assume that it is in reference to firearms.
If you can find someone with a kali background, you should be set. If there is one martial art style that taught me the most about applicable/real world armed and unarmed combat, it was Kali.
That being said, Hawaii laws are NOT laxed on knife carry. Everything from the types of wounds you inflict, to the type of knife you carry, to the type of training background you have will all be taken into account and will be possibly scrutinized and used against you in a court of law should you attempt to use your knife; even in a self-defense situation. Just make sure you take the time to learn the minute details about knife carry laws and the proper knives associated those laws before you attempt to do so. 
I am not strictly implying knife tactics, but the ability to train and practice needed skills, whether that is drawing a pistol, knife, flashlight, pen or other while being overwhelmed by another person(s). I am also referring to use of force on a sliding continuum where verbal dissuasion, unarmed combat and armed combat integrate. Related, controlling and disarming another persons weapon the skills have commonalities whether it is a fork, knife or pistol.
Kali, I have done some, imo it is critically as important and less practiced of accessing, deploying one's weapon be it a pistol, knife, flashlight, baton than of using it.
We are fairly fortunate with the knife laws that exist in comparison to other states as there is no limit on length or form of carry. The dangerous weapons clause and suspicious activity can be a catch all phrase, but a single edged folder or fixed of any length is deemed legal as long as it is not considered a dangerous weapon.
Thank you for the friendly advice.