If it was me with no welder... umm !
Cut off top cross bar approximately 2" out from the QM Mounting.
Attach the Bucket to,the QM System.
Get a piece of 2.5" 90 degre angle steel, the correct width.
Drill some 3/8" or 1/2" holes in the cross bar and the new angle steel replacement cross bar.
Using some grade 8 bolts, mount the cross bar to the side mounting points of the QM.
The cross bar, although important, appears not to have a lot of stress on it, bolts should work ok if grade 8.
The lower bar looks small enough to be bent with an added bar on one of the mounting points.
Good luck.