Dear Tom,
I have often thought that Gene Wilder could play a very good version of the Fourth Doctor on film, akin to his performance as Wily Wonka. He has the wild eyes, crazy hair and deft balance between unbalanced maniac and garrulous uncle. If you weren't up to playing yourself onscreen (Doctor Who meets Scratchman aside), do you have a shortlist of contenders?
Unfortunately, they wouldn't have the Baker-voice, though I do live in hope that one day Scratchman might be released as an audiobook narrated by your kind self! (I would settle for Doctor Who meets Abbott and Costello!)
Best wishes,
Anthony