Do you have a hitch for a 2” receiver on your bucket? (Bolt on or have some one weld it?)
If I were putting a boom pole on, I’d use the hitch and use 2” tube stock. I think length of your pole (don’t make this weird

) also might suggest other ideas?
Edit: just saw
@McMXi post and I like that idea better assuming you have SSQA. If not just buy a new tractor with SSQA.