As promised, here is an update to PropDesignGeo script for MoI, with through points for airfoil. (interpcurve factory).
The tantan point did change a little bit.

Due to the fact that a change in RADIUS or ROCR causes a change in the airfoil, and require a different tantan point, it
was necessary to reverse calculate the z_tantanPt, for the default airfoil, to a z_AFXTAB point. (Which came out to be, AFXTAB_tantan = -0.57937.)
Wrote a crude excel spreadsheet to reverse the formula. The formula is listed in the script.
AFXTAB_tantan = (250 * (RADIUS/ROCR) - z_tantanPt) / (10 * RADIUS/ROCR).
Now the new tantanPt is correctly calculated, in the event RADIUS or ROCR changes.