I made a black mask that looks the biz but is completely breathable without restriction. I used open-cell foam and mosquito netting.

You can make the blue masks more breathable (but not perfect) by cutting out the inner white layers.

And if you can get the N95 with the breathe-out valve, you can modify it to allow free airflow both ways. ?

Of course the ideal situation is NO mask but, here in Greece, there's a huge fine for the SHOPKEEPER if he allows a customer in without a mask. So some discretion is required.