There is no escape...believe it or not. Mathematics is everywhere.
The Association of Teachers of Mathematics is a friendly association of teachers of mathematics, run by teachers to enable teachers support each other. It has a journal called Mathematics Teaching which exists so that teachers have a place they can publish their ideas. The editors are very helpful an supportive. I'm not sure if you have to pay to join to be able to publish, but you can e-mail the editor and ask. If you do join you get the journal and access to lots of useful stuff.
Good luck with your idea.