Not that I know of but they do make a bike rack that has a 2" square collar mount that slides over the 2" bar you already have
And they make a "Dual hitch adapter" basically this is a 2" rise/drop (both at the same time) or a straight through /4" rise adapter.
Like this Amazon one
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times