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would digitally signing and marking as no changes possible after signing work?

No, because when companies receive an unsigned resume (after modification), it will look like every other unsigned resume they receive

Some companies want resumes submitted as text or .DOC, for easier keyword searching perhaps. Or to avoid viruses? So the recruiter may OCR the PDF, then "improve" on it.

Why bother?

Apparently everyone keeps forgetting that PDFs are editable.

It's really not made to be and with the exception of an embedded file that's actually editable (eg: LibreOffice optionally keeping an ODT version inside the PDF), "editing" a PDF tends to be a disaster of trying to match the layout with whatever text you are attempting to edit.

Certain tools, such as Word and LibreOffice, make it a bit easier as most of the source text is in the document, others like LaTeX end up looking like garbage through machine processing.

Although if you're just trying to add a bullet point to the end of a list that would often be fairly straightforward.

Does the PDF contain the whole font in such a way that anyone can add text in that font? I ask because I use uw-garamond from the Mathdesign package.

It can. You decide if the font should be embedded or not.

Roger dodger. Gonna have to convert everything to vector drawings to be safe.

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