I don't want to have to buy new glasses either. Your close-up reveals that the left lower half square is 1/8" or less away from the center of the pinwheel.
This is not a do-over. If you had cut off the point of that unit, then I would agree
with a little seam ripping, but you are being too hard on yourself.
Is this a quilt that you are submitting for a prize??
-congratulations on a good pinwheel block - Judy