OK, this is a stretch but follow me
...Off-Screen The Real Charlie and Chuck Lorre make "peace"
They don't need to be BFF' s but at least "be decent"
Have EACH cast member sigh a Quiet NO disclosure statement
NO audience ( to avoid the leaks) and dub in the audience woo-hoo's and cheers
In a creative way, Charlie comes back ON screen and .......
Has a GRAND finale of a scene.... and close out the Rose storyline,
a last laugh on the MOM and a TWIST with Alan ...
perhaps, have Alan and Charlie sneak off and live off
Charlie's benefits (inheritance) . . . ...As Walden has NOT
sold the house ....
OR a variation having Charlie return and have END game and closure...
the way the show was originally intended to end ... ( and perhaps
Charlie RIP Walden and put him in place) ....