Simplest way I've found is to be a member of the Scouting Movement (or other youth organisation). If I were to be stopped whilst out and about when carrying things that might cause concern I'm simply training, trialing and researching in order to further my understanding so that I can pass on that knowledge with the hope of inspiring others.
For anyone short on free-time and not wanting/able to become too involved (it's not just 2 hours a week folks!!!) you can be a Section Assistant (doesn't require a uniform or too much training) by attaching yourself to a scout group or district and help out on occasions relevent to you - a lot of groups are hankering for people with bushcraft skills
and there are funds available to subsidise the cost of relevent training courses
.
This would mean that while you help kids (and adults) learn you are covered by a world-wide recognised organisation, you have CRB coverage (you have to be cleared and covered but you don't pay for it) and you are insured (most groups pay for adults on their books) and at least some of the courses that you'd like to do should become a bit cheaper.
The amount of wooded campsites which are availabe to you significantly increases as well
because you can go off on your travels checking out sites that you'd like to take the scouts to; it's actually written into the blurb that leaders should check out sites prior to taking their charges there
.