I'm into trials about one year. Around my city there maybe 3 or 4 places like this. (Plus tons of open trails in any direction)
There's a lot to learn yet.
https://youtu.be/48Y71VS_uJ0
Valentino Rossi is on top level and always found a way to promote the sport. It's a responsibility of the big names on sport but depends on their personality.
You need something like that:
http://thekneeslider.com/derbi-dh-20-motorcycle-mountain-bike-concept/
or
http://www.sugarcayne.com/2013/08/motoped-conversion-kit/
Some expandable foam + fibrgrass shell. Then add EVA rubber to have an soft touch and the seat cover.
With this small seat, I broked that initial barrier that keep people away from trying Trial.
Now my wife ride with me! http://youtu.be/1dQ7BdhSUfs