I feel in homage to Stan Lee, that Deadpool, should do all future cameo roles with a mustache and the rimmed glasses to stand in for Stan Lee (once they run out of per-recorded cameos).

I believe this would be something Stan Lee would of recognized as 100% in the scope of Deadpools ability, and a great way for Stan to live on in name and spirit in all future Marvel Movies.

Remember Deadpool is the only one in the MCU that knows he is in a comic/movie, and he will be the only one of Stan's Characters that knows about his passing.