Hel -just don't go there!
Most of these problems disappear if you don't go to some hel-hole with 50x the fun and safe number of riders.
But the pictures and rules look good mostly.
It is obvious common sense to avoid sailboats and motorboats, but it's better not to make a "rule" that kiters give way to them.
This is opposite to colregs and sailing racing regs so just don't do it.
You especially don't want to put up signs showing kiters getting out of the way of boats, when the problem is, sometimes we are not able to get out of the way even if we try.
As for tricks, the same traffic rules apply, unless you have a contest or something where you can set up a tricks-only area.
For surfing, again the key is to find space.
If it's too crowded, waves are not going to be fun or safe, no matter what the rules are.
By the way, Richard although your post is way too long and I couldn't read it all,
I better point out I think you are dead wrong about port and starboard.
Every other water user follows the same colregs/rules of the road, and kiters better do it too,
or we will always lose out and be fighting boats and windsurfers
(from shore, after we get banned).