I think a red card (and subsequent absence from the next game) is enough for punishment. The fact that Mourinho talks a lot is part of the show (and actually it's not so bad for football as a business) and it seems to me that if the functionaries are serious about his every word (even unfair) then this will cause more suspicion and rumors of foul play , referee conspiracy, etc.
That might be a good show for the league itself, but even for business, there is a line that shouldn't be crossed. By that baseless accusation he said in that game, then it means that he doesn't respect his opponent, by saying the match was fixed and in the other words, Cremonese shouldn't win. I saw the match and Cremonese deserved that win.
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I dont think that disrespecting an opponent is some kind of special crime for which special sanctions are needed. I understand that the line between a show and defamation (which is a criminal offense in most countries) is quite thin, but I would prefer it all to remain in the context of trash talking rather than litigation.
In any case, Mourinho has already created a meme about the danger of words
