Which software converts academic publications from PDF to Word without mangling complex formatting? I'm asking about this in StackExchange Academia rather than a software-recommendation site because I have conversion problems specific to the layout of academic publications. I'm helping a student who has problems with their eyesight. They find it hard to read academic papers and books on screen, when distributed as PDF. They prefer to have these converted to Word, then read that on screen. This helps them because they can change the font of any part that's hard to read, as well as highlighting section headings and other cues to help them navigate. There are many PDF-to-Word converters, but all the ones I've tried (see below) have defects. Can anyone recommend something better than those I've listed? The converter must not mangle tables, diagrams, footnotes, formulae, subscripts and superscripts, or other complicated content typical of academic publications.
The student does not like to read printed text, and only has an A4 printer, so blowing up the text and printing that isn't feasible. The pandemic introduces its own constraints, since they don't want to venture from their flat to use University computers. So they're restricted to what I think is a 22-inch screen, Windows 10, and their A4 printer. I only mention these because commenters suggested them. The student is comfortable reading Word files, and I want to help them do that, rather than force them to do something outside their preferences.
Getting back to PDF-to-Word converters, so far, we have tried:

Kofax Power PDF, but it's very erratic, though. For example, when I converted an archaeological report which I had to ask Power PDF to OCR, it &quot;thought&quot; it had found characters in the thin lines indicating boundaries in a diagram of the archaeological site. Power PDF also mangles structural chemical formulae, even when told not to OCR. Footnotes and tables cause even more problems, as do in-line chemical formulae, and subscripts and superscripts.

SmallPDF. This claims to be &quot;the platform that makes it super easy to convert and edit all your PDF files&quot;. It is not. It converts some so they work better than those done by Power PDF, but crashes on others.

PDF24. This probably does a better job than either Power PDF or SmallPDF, when it works. But on some PDFs that need OCR'ing, it just emits the original page-images. This may well be a bug, and I've reported it, but I've not had any reply.


Does anyone have any recommendations?
UPDATE: The question has gone through 10+ revisions since I wrote this answer. I haven't checked to see whether it is still relevant. I'll try to respond to comments.
I'll start by disclaiming: My initial solutions do not follow the prescribed pdf to doc conversion (whilst my last solution does, albeit, it's probably a bad solution), and I haven't tested them, which violates the OP's constraints. I disregard these constraints because I don't think they are particularly relevant.
It isn't clear whether on-screen, digital reading or printed, physical reading is preferred, nor how much adjustment in text size is desired, clarification may allow more focus.
The trivial, obvious solutions, which have surely been tried, are: Large screen plus zoom and printing to a larger paper size, e.g., A3 or A2 (the former being more commonly available), rather than A4. Annotations and highlighting can be applied to pdfs with numerous tools.
For various other enhancements, numerous tools exist on Linux, which can be scripted to suit needs. For instance, a page could be split into smaller parts and manipulated in various ways, e.g., split a portrait page into top- and bottom-parts, and blow up each part onto a horizontal page (optionally of larger size). All operations can be automated. This approach cannot fail particularly badly for academic papers. At worst, perhaps the split is applied in the wrong place, but, the two parts can be displayed simultaneously, aligned at the lower/upper edge, or by folding the top edge of a printed page.
Linux tools can also be used to convert to word processor format, for instance, pdf2ps and ps2txt can be combined to convert pdf to plaintext, which any word processor can open. (This is my worst solution. I doubt tables, footnotes, formulae, etc. will be handled particularly well.)
Converting to a word processor format seems like a misdirection. That's why my last solution probably won't work. Extracting another format from a pdf seemingly goes against the design goal of the pdf format, namely, to present documents in a [software independent] manner...encapsulat[ing, in each file,] a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it (source: Wikipedia).
My apologies if I'm way off mark here. I'm unsure of your precise requirements.