Have you ever seen the movie "Galaxy Quest"? It is an affectionate comedy starring Sigourney Weaver, Alan Rickman and Tim Allen about ex-Sci-Fi actors on the convention circuit who are called out of retirement by real aliens (who believe their TV episode transmissions were genuine space exploits).
The humour is right up your alley and a movie like this would be a great vehicle for you -- you could be the "William Shatner" of Doctor Who but wth better hair!
P.S. Can't wait to hear you reunited with Michael Jayston from Nicholas and Alexandra after all these years! He also played an evil version of Doctor Who (called The Valeyard) on the show in 1986.