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Just went to a fotostore and got a 80€ ND fader, from 2-1000x
The only other available was 250€ from B&W and I originally wanted to get a Hoya fader for 75€ from amazon, but it would not have arrived on time for my next trip.
I never heard from the producer, B.I.G and couldn't find anything online about them
Went home to ckeck it out and I gotta say, it's damn good. Slight yellow cast, no signifcant loss of sharpness. The exposure times were 1/60s and 1.3s on the Lumix G85 and the 12-35mm 2.8 at widest aperture.