I use "Hope this finds you well", a lot when addressing clients I haven't spoken to in a awhile. I don't expect an answer, unless maybe something big has happened like a baby, engagement, house, etc.

I would read the OPs example as the same, and not answer the question directly. Seems too formal for someone who really wants to know what you're up to!
I believe in manicures. I believe in overdressing. I believe in primping at leisure and wearing lipstick. I believe in pink. I believe that laughing is the best calorie burner. I believe in kissing, kissing a lot. I believe in being strong when everything seems to be going wrong. I believe that happy girls are the prettiest girls. I believe that tomorrow is another day and I believe in miracles.
Audrey Hepburn