swapping input images for scaled images and project file fixup

Hugin persists the absolute rectilinear coordinates of control points and other features in its PTO files. Should there be a need to swap out the original source images with different resolution images, the project is broken and cannot be stitched. Is there a way to fix up an existing PTO, scaling the X - Y coordinates to conform to the actual size of the images as they exist at run time? Or some proper way to use scaled proxy images?

After proxy images are swapped out with larger ones, all the control points are clustered in a mass in the upper left quadrant of each images - indicating the values are not scaled in response to changes in the input images.

Part of the motivation is that Hugin control point detection does not seem to support scaling options ( like sift-autopano ), which would sidestep my issues with blurry source materials where scaling the images first help the point detector to find features by reducing the absolute blur radius.

Before I start plying hands to keyboard, I wonder if there is some tool / script that does this fixup or if there is a hidden "make it all better" button I missed.

Thanks!