I know of the machine at colour city in France, I was following a thread which was taking about the machines having to be removed in late 2018 possibly because of space issue there, but then getting a reprieve until Feb of this year. I can't find the thread again, should have favourited it. I remember the thread talked about the machines being the size of table tennis tables that seems big to me.
I found a little family run German company that thinks they might be able to make it but wondered what the demand might, which I can't really say, have asked on the groups I'm involved with but not had much of a response.
Details of email below from ADOX in Germany. Maybe your interest and the 6,000ft of film, might get them to look into the process in a bit more.
Carl
Dear Mr. Potter,
Thank you for your email.
I need to talk to our technical-team to see if we can produce this format, but it would be great if you would tell me more about this appetite; Could you give me a quantity of your need/interest?
Thank you in advance.
Best Regards
Bijan Boroumand Fumany
______________________
Film & Paper Department
Research & Development
ADOX Fotowerke GmbH
Pieskower Str. 30 A
15526 Bad Saarow
Handelsregister Berlin Charlottenburg HRB 122723 B
Geschäftsführer: Mirko Böddecker
info@adox.de http://www.adox.de