If you do a truly outstanding job, do you make a spectical of yourself?
I like the noses and eye sockets...
You could make a plaster cast of someones face then just get some floral Green Block and just smack it into the mold.... it will take the shape then you can slice away the extra.
Mylar is good, but I like the strength and long term hold power of fine brass wire. You can feed a loop up through the foam and fabric. Run the glasses into the loop, and pull it tight.
Splay, glue and tape off on the back.