This is what I did a few years ago. I removed that plate in photo #1 and had a custom four bolt plate welded to a stock class III hitch receiver. You can then use any ball mount.
I have a complete snowblower assembly for my Kubota G1900 less the male G2549 quick hitch assembly. Looking to purchase this part, part # 70060-03066. Thanks Peter W. Goshen, CT