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If this is news to you, there is a fantastic free and open source project at https://recalendar.me/ which you can check out (which sadly seems relatively abandoned).
Your technique is one I would turn towards as a developer who understands HTML/CSS flow so much better than I do any typesetting tool. I actually use a very similar technique for managing my CV and generating invoices for clients; I have a little "static site" generator I've written that takes JSON, throws it through a templating engine, and spits out HTML files. I then host a server in the output folder and print-to-pdf directly from there. This approach seems quite rare; I don't think enough people appreciate just how flexible CSS is or its support for common print-related tasks.
Building your own templates is pretty fun, but look out because it can turn into a real rabbit hole if you get into it (in my case, a full side-project: https://hyperpaper.me)