Go as yourself

You need to show YOUR dominance over her. Not anyone else. You need to figure out a plan to reach out Hermione but Ron seems to be with her(Lucky bastard). The only way to reach Hermione is to ask her for help. So you prepare up to a plan and you walk over to find Hedwig only to facepalm yourself. You borrow Errol, who is miraculously alive after all these years and begin preparing your letter.

You need to do this by yourself without much help from Figg. You set your base at the Leaky Cauldron while Figg gained control over it hence no one is none the wiser. You go to your room and think about what would you write...

Now you can gain her sympathy by faking an illness or explaining the situation to her to break it(not entirely, the curse is unbreakable).

So what would you write?