I guess something like this could work, will have look into this in debug.
This diff doesn't revert rB450685b15664 actually
And there may be issue, that 50% proxy of clip that is 1000 x 1000 will be 500 x 500 regardless of what your project resolution is set to.
I haven’t tested it but
The clip should scale to fit when the offset button is turned off,but when it I selected it will stay at 500 x 500