When I was 11 or so, I insisted to my parents that I send my Spawn #4 to the address on the inside cover (Image) with a note asking Tim McFarlane to sign it.
My parents thought it was cute but prepared me to never hear from them again.
And we didn't ...
About 10 months later a big envelope arrives for me (which was strange), I had completely forgotten about it at that point.
Opened it up, and there was my comic signed by the man himself in gold marker. I was ecstatic.
Think that old school method might work still? Think if I send Tim or Mike a comic snail mail, they'd sign it and return it back to me?