I doubt that my way is any "better" than yours, but it works for me.
I taped the corner of a plastic storage envelope to the top (inside) of my PSK and put the mirror in there, along with my psk cheat sheet (phone card numbers, emergency nrs etc). I use the mirror a lot.
I made mine out of a metal coleman mirror. Not too bad, not as good as glass, but servicable. I cut it down to the right size with a dremel tool rather than shears as shears distorted the metal more than the dremel tool. It is a dual sided mirror so I drilled a hole in it so I can aim it better.
I like the metal mirror. I tried plastic, but could not find a plastic 2 sided mirror. Putting two plastic ones back to back was too thick. Coleman Metal Mirror is $1.50usd. The commercial mylar mirrors are too thick.
nomad
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...........From Nomad.........Been "on the road" since '97