One of the members here...Bud...made something like that. He told me it worked real well. He uses it along with his normal loader bucket.
One on the rear and one on the front. Hauled more dirt in one pass than I could with my loader on the front and dirt scoop on the rear. Need a hydraulic top link to do it though, whereas the dirt scoop works using gravity for the dump.
Still...making one may be on the front burner after I get my top and tilt setup. Would be neat having a loader bucket that could tilt as well as lift...