Ah okay, so they probably operated something like a LVT recorder. Those are kind of rare, but over the past few years I've seen a few people post about them here on Photrio, so there's likely a handful of people who might still be capable of doing this.
The following are search results and they are not necessarily a good match with what you're looking for:
https://analogue-arts.com/dtf/ (no price listed for B&W 35mm)
https://www.griffineditions.com/lvt-digital-negatives/ (only 4x5 + 8x10" film)
https://www.panopticonimaging.com/#/digital-services-2022-update/ (they seem to fit the bill; scroll down on that page)
I know there used to be someone active in Germany as well, but I can't find the website right now and I've always had my doubts whether the offer was still actual as the website looked outdated - but that doesn't say much in itself of course.
Sorry of this is of little help. Either way, you might try including terms like "LVT" or "film recording" in your Google-fu.