Your choices for stuff that is ESA compatible and will permit any level of modification is slim to none.
The only easy choice is swapping it for a manual suspension, which I do have.
There is also W-ESA by wilburs, that can be tuned somewhat to your needs. I've already done some looking for suspension alternatives and didn't find much, i'm usually pretty good at finding answers to stuff. I had a similar problem with my k16.
Ted Porter based in Cali, runs the Beemer Shop. He's a good guy to talk about suspension related stuff.