Wow, that is a nice list of upgrades! So much win. And unfortunately there was no BBK officially for the 335i. What some people tend to do is fit the 135i kit (with 6 pot Brembo made brakes - branded BMW Performance), but the 135i has smaller discs, so although it's an upgrade in some areas, it's a downgrade in others. But like you said, the main appeal is that they look awesome.
Whilst you have one hell of an upgrade list, i would definitely trade one of those upgrades for upgrading the Prof Nav to the latest version. This is a huge upgrade in terms of functionality and style. Can be done quite easily for about £1000-1200 and would really modernise the car.
Enjoy - you have a lovely car.