It isn't a "solution" but those stick on aluminum "Nose Bridges" can help a little (they shape the mask around your nose so your breath cannot travel up as well

It isn't a "solution" but those stick on aluminum "Nose Bridges" can help a little (they shape the mask around your nose so your breath cannot travel up as well, fogging up your glasses). You'll still get some fogging even with a Nose Bridge, but it is less severe. They're available from many online retailers for quite cheap.