Yes...Micahel Joly offers a mod for this, as does JJ Audio, I believe. However, I wouldn't touch mine because I love it just the way it is. It's one of those mics that can cover a lot of ground as is but isn't perfect for everything.....In this case I'd say that if you don't dig the Bluebird just sell it, and buy something else you want. These days with the availability of cheap but quality LDCs there's no reason to mod a mic like the Bluebird IMO when you can get a mic to an exact or at least similar voicing to your liking within the same price range as a Bluebird new or used.
What the Bluebird does it does well, which is actually quite a few things. But modding a mic like that is sort of like modifying a Toyota Corolla so that it drives more like a Honda Civic (lateral move). Just buy a Honda Civic if that’s what you’d rather have.