A simple twist tie in the bridge of the nose part of the mask can work wonders here! It's helpful to know someone that can sew the bridge closed after you place.

There are also companies that make masks with buttons around the ear loops. These allow you to adjust to fit your face more closely. (Banana Republic is one that does this). If you use the 2 together, you can create a sort of vacuum around this part of the face, and have the glasses sit on top. The piece on the bridge of the nose (we've also discussed trying pipe cleaners instead) has been the biggest game changer.

I feel you with the discomfort, and feeling sweaty and uncomfortable. We've started going hiking with friends, and they are so darned uncomfortable when you are breathing heavy. LMK if this helps. I do hope it does!