I get that feeling Rob
Thankfully wind
isn’t an issue where I live (normally unbearably still).
I thought that a truss design (if up end up down this path) would remove this concern. As for the strings, I thought crossing them (not in the main "tube" - don’t want to cause unnecessary diffraction) would increase the angle and hopefully address any stability concerns.
Having considered your advice about the truss system, the other possibility may be to use a sonotube and then brace it on the outside.
Thanks for playing the Devils advocate thought