Are you sure that by just adding Painter to CtrlCore.upp and NOT using any specific functions from it, you can improve the look of app?
I compiled two versions of one application, with and without Painter, made screenshots and compared them in GIMP at high magnification.
They are identical pixel to pixel. I even changed the size of system default font and applications zoomed. Again no difference.
The only difference is the size of applications.
So, I'm afraid that simple adding Painter only adds 100 KB of unused code.