May not be pretty, but it’s working really well. Bottom to top: plastic screw, nut to tension it against the plate, standoff into the brass heatset inserts.
I may need to rethread the right side. Not surprised by the flex though, was kind of planning on it with the rotation and tilt.
I tried the original dactyl manuform and then found this one (Carbonfette). It’s a huge improvement for me. Splay on my hand is narrower and more comfortable.