PPE is the wrong solution here. Tools that don’t produce dust are the right solution.

Wet tile saws and waterjets can cut stone (and engineered stone) with essentially no dust. An angle grinder with a dust shroud and HEPA filtered extractor (total cost starts around $400) can do the same thing a regular angle grinder does but with a lot less dust.

And one really can work all day in a pouch-style N95 mask. They don’t collect much more than 95% of fine dust, but they do work, they’re easy to fit, and they’re easy to breathe through. I would wear one for added protection if I were using an angle grinder with a dust extractor. (Although I might use a full mask respirator instead for eye protection. And PAPRs are pretty great if rather expensive.)