[Python] Correcting UTF-8 missing characters error in a PDF generated by an automated Photoshop

I'm having a very specific need here: I generate PDFs through Photoshop automation, but Photoshop fonts don't implement fallbacks, so any "exotic" UTF-8 symbols (chinese symbols, mathematic symbols) is a barred rectangle.

Photoshop automation being pretty limited, I had the idea to export the PDF in a way that conserve layers and texts and then, activate character fallback in the PDF itself. But I can't find any documentation on how to do that, do you think it's possible ? Do PDFs texts even exist as real text or is it just an image with some metadatas ? Would I be better off modifying the fonts used by photoshop to add all the glyphs of the UTF-8 table ?

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