Kudos to you for doing that.

I've been publishing print and ebooks since 2015, and I can attest to the fact the Word to PDF X-1/a to epub/kindle pipeline is painful. Making minor edits after publication is also painful, as the author notes, and can be error prone if you fail to make identical changes to all formats.

The problem was bad enough that I built by own markdown to HTML to PDF/X-1a processor using Python, WeasyPrint, and ghostscript. This also allows me to use git for version control, and I can make formatting changes using vanilla CSS. My tools are currently too crude for the average non-tech writer to use, but they save me hours every time I use them.

For any of you hackers out there looking for an untapped market, try making a user-friendly tool that converts Word, PDF and/or similar formats to the print-ready PDF/X-1a, PDF/X-3 and PDF/X-4 formats. At the moment, all the existing tools are proprietary and expensive, and many are difficult to use. This won't be a big money maker, but it will certainly be welcome by many indie authors.