I'd of course be happy to have to support for that. Do you happen to have access to Eurostar tickets or sample documents?

Yes I do, I'd be very happy to supply them however the tickets haven't been used yet and contain some personal information is there a way to remove this so I can send it to you?
I tried my hand at making my own extractor but couldn't get kitinerary-workbench installed (I'm not very good at anything more complex than simple bash commands but I might give it another go)

Right, that is a recurring problem with such documents unfortunately. If it's in a textual format (HTML, email, textual barcodes, etc), search & replace for your name, birth date, credit card/passport number, etc with distinct same length dummy values can work, for PDFs or unknown binary barcode formats it's largely impossible (either the data isn't fully removed or the document is altered in its structure too much).

How did you try to install kitinerary-workbench, via the nightly Flatpak build?

Eurostart barcodes are supported now, but they don't contain information about the departure time (just the departure day) nor the station names (just station codes). So we'd only need to get those missing bits from the PDF.