Interesting question -- Most folks try to avoid getting their rating lowered.
There are ways to lower a boat's rating. You can sail it really fast, consistently.
If you don't have time to do that, there are some other ways.
I don't know if they'll work in your case but I'll mention a few that come to mind.
- Feathering/folding prop
- Oversized spin pole
- Oversized genoa (i.e., >140%)
Most of these each result in -3 to the rating.