You'll get an invoice, or rather a payment confirmation with your details, when you buy an Interrail. Would that work? If not, I'd suggest to contact customer service after buying the passes:
https://eurail.zendesk.com/hc/en-001/requests/new
OR by from trusted old PKP-all railways are participating in this scheme and most should also be able to sell it. They will know best on how to handly the POlski fiscal nrs etc.
Unfortunately, we can't issue proforma invoices. You receive a standard invoice after passes have been completed. You're welcome to reach out to customer service via the link above if you have any further questions.
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