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Is there some other version of the files available? I'd love to mix your idea with something like https://www.thingiverse.com/thing:2224776 or https://www.thingiverse.com/thing:1686378 but FreeCAD that I'm most familiar with isn't the best with STL files (or I'm really bad with FreeCAD which might be the case as well).

Alternatively, have you considered adding structural braces to your base so that it stabilizes your Kossel while also providing bed leveling?

Reinforcement Kossel Mini
Kossel Mini 2020 Frame Brace