I work in an industry where high noise levels and the need for dexterity can be an issue. Generally it’s overcome by voice activated microphones and headsets, with different teams working on separate channels to avoid chatter.
That being said, I’ve never struggled to communicate using a fp2/fp3 disposable mask (in no way meaning to diminish your other half’s experience).
I think the post above nails it for this situation. Short, punchy and direct instruction (where possible using pre-agreed phrases) and absolutely encouraging silence where possible.
Given the additional PPE and the need for folk to get used to communicating in a different situation, simple is maybe best in this instance. It took a long time to effectively implement radio working across multiple and common channels.