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if only there were an open source and easy to use pdf library with pdf/a support :/

It looks like the IETF has some tools for this. A quick search revealed https://github.com/ietf-tools/ietf-at

The mentioned RFC PDFs are generated with Weasyprint which gained PDF/A support apparently last year. https://www.courtbouillon.org/blog/00028-weasyprint-56