Making everything in the document thicker

The problem is how to make everything in a document slightly thicker.

My starting point was spurred by Computer Modern, which I would like to make thicker. In this question, the problem was almost solved via pdfrender or alternatively pdfliteral. The remaining problem is that horizontal lines in math are unaffected.

However, the answer to this other question suggests that contour could be used to make the remaining parts of the document thicker. Essentially, this is mainly showing in fractions and the horizontal line of the square root sign.

Is there a way to “automatize” the process of applying contour (or the technique used by it) to those remaining parts of the document or, for that matter, everywhere, without the need of pdfrender?

As an alternative solution, we may apply poor man’s bold to the entire pdf. Is it possible?