I do have a couple old house brackets and some spare angle iron laying around. For extra security it might be a project for this spring.
That tower represents a lot of your hard work and I hope brings you a ton of good DX.
Also just to be clear not trying to be snarky about your project..
Just looking at the wind load of the antenna plus including the wind load and weight of the mast and coax. Also thinking about two yagis that can torque the tower from side to side in the wind. Then the roughly 14 foot of mast above the tower and the 24 foot Imax gives a lot of vertical height for the tower to hold against wind.