The difficulty of such a hypothetical, of course, is that it wouldn't have had the budget for anyone really famous (the TV version of Archer's Goon didn't have anybody more famous than "played a villain in a middling Doctor Who story", though it had at least three of those). Or, at least, not anybody really famous now:

I mean, if it's your fantasy casting, I think you have leeway to include at least one unlikely person, just because you never know. Or you could make it a radio serial and surprising people will sometimes do a radio thing, even if not a TV one.