Marokai, what do you think of this and how should it proceed and still be valid legally?
Simple, instead of making it an instant punishment which
would be a bill of attainder (and subsequently unconstitutional, IMO) just make refusal to appear in front of a Senate committee a crime, specify the range of punishment, and write procedure for a prosecutor to be selected by the committee to bring up the contempt case for judicial review from the Supremes. The court process would basically be a formality and you'd get the same result.