Creative Ways of Getting Teaching Experience
First of all, put down all of that experience on your CV, and when you apply for jobs, make sure you write a great teaching statement on some of these experiences.  Make sure to talk about any courses you designed (the LaTeX one, perhaps?), and don't disregard the high school teaching at all.  I was a high school teacher for seven years before I went to get my PhD, and when applying for college teaching positions, I played up the fact that teaching high school is (in some ways) more challenging and that it made me a better teacher.

I believe that with your current experience, you have a good chance at one of those community college adjunct positions (depending on your field), so don't sell yourself short yet.

One other option that might not sound so great but could at least get you into the classroom is to apply to adjunct positions with for-profit colleges (U. of Phoenix, etc.).  If you can disregard any problems you might have with that "type" of education and dedicate yourself to doing the best you can for the students, it would give you experience.  The problem may be that you're in the sticks.

Speaking of living in the sticks, are you able to move for a semester?  If you're flexible enough, you will be able to find that adjunct position (Alaska?  Kansas?  Puerto Rico?).

Let's say you can't find a teaching position.  What's stopping you from developing a full-up course, even if you won't teach it now (or ever)?  Be creative, and design the course you've always wanted to teach!  You can then put down, "designed xx undergraduate course, which included a unique assessment plan and a flipped classroom approach, blah, blah, blah."  A bit hokey, maybe, but it's something.

Depending on your field, you could branch out and apply for positions or volunteer to teach classes that aren't directly in your field.

The bottom line is (and you seem to already know this): you have to be as flexible as you can if your goal is simply to get college teaching experience.  But try to think if there are other ways you can be even more flexible, and something is likely to come your way.