navylad as a side note, thinking back to, I presume, your 'the ships buggered' training ( as an ex marine who did it several times over in his life but forgets the proper name for such things) have you found any mask which works well outside of N95's?
I've had issues using the things in an Uber. I seriously have airway issues using them and cannot wait for a, short, journey to be over. Whilst I have serious medical issues ( lupus and a failed immune system) respiratory issues aren't normally an issue for myself.
I'd personally find it useful but I imagine the OG poster's wife would as well.
That said if you've not had any issues yourself of course you probably wouldn't have looked at alternatives. I also believe the SI is for a "face covering" so I am tempted simply to wrap some form of cloth around my face as nothing dictates what my face covering should/ must be.