Ok everyone, here is the response i got from Wittner Cinetec,
He gave me permission to quote his email here, a very interesting read:

Thank you for your message and thank you for the given link into the APUG
Very intersting discussions there!
Unfortunately we are not allowed to participate on discussions about
products of other suppliers.
But I would like to express my gratitude to the members of this forum for
inviting us so friendly to join in.
We very much appreciate it!
But indeed we are always open for suggestions or comments.
I will discuss this issue with Mr. Wittner, if and how we maybe could become
a member of your forum.

About Aviphot Chrome:
The 35mm product was indeed a "side effect" on our way to make this stock
available in the Super 8 and 16mm motion picture formats.
We were in need to get experience how to treat Polyester base to make it
capable of running through motion picture cameras without any problems.
All our MP film stock was Acetate based in the past.
To start with a bigger size (35mm) as a proven format seemed to us more
secure, before moving to the smaller sizes.
We have bought the two Buko film perforators from Efke / Croatia, after they
stopped their production of Efke 35mm film.
Those machines were used to perforate Polyester based film in the past - and
were perfect for us to run first small batches.
In the end, after doing some tests, we finished 36.000 ft in perfect
quality. This product is available now in 1200ft and 100ft length to be used
in 135 still film cameras.
I fully understand your wish to obtain this stock in 135-36 film cartridges.
I promise to ask Mr. Wittner for this kind of finished product. I will
inform you as soon as I can, if there is a chance for such a production.

You are allowed to quote my lines (if my message is understandable due to my
poor english) - if you desire.

If you need any further assistance, please feel free to contact me again.

Mit freundlichen Grüßen
Best regards

Ingolf Joost
Wittner Cinetec GmbH & Co. KG
Beaulieu Deutschland
Posso Deutschland