The wall thickness on mine is 3,5 mm. The diameter is identical. I end up with a length of about 8,35m. Think your 30kg is not far off. The sleeve on SISKIN is a device that could hold a flagpole in place. It weighs in at 20kg in itself.
While creating this setup the mast received a fair amount of holes drilled into it and a large selection of rivots injected into it. Not a happy state of things.
So - when I run into a flagpole of some appropriate dimension - I think I will not hesitate.
Espcially with you hinge input - very highly appreciated - thanx!