The problem of having weak institutions comes calling in such cases. The police would be told that the President is Immune and stay away. Nowhere does that clause stop investigations.
The way I see it:
1.President Pundit breaks the law;
2. MP Moonki citing investigations by an independent police files Impeachment charges
3. An Impartial and highly conscientious parliament hears the case and in the end impeaches the President
4. The President, ever so graceful, voluntarily leaves office and
5. He is arrested the next day and tried for the crimes
6. The Presidency is saved the ignominy of appearing in court - make believe handovers notwithstanding.
The key to this process is having an independent Police and Prosecution willing to exploit their power to investigate anybody and everybody including the President. The President can be interrogated. I see nothing that says he can't.
Now this has happened in Israel with Moshe Katsav. In his case, he skipped 3 and made a deal with prosecutors to plead guilty and get a mild sentence. He reneged and as I speak he is in prison serving 7 years. (Am just saying: if he had taken the plea in 2007, he would be long done with the case!- May be something Uhuru could think of considering his case will never really get stale as long as he is alive.)
Civil Proceedings:
I must confess not having really looked at these provisions keenly. I must have made some unfortunate assumptions. I think this is fair. It was very sad to watch some Mhindi businessman go bankrupt as Kibaki refused to pay him for the rental of his cars during the 2002 campaign. Instead of being a gentleman to pay the guy, he hired an expensive lawyer to go to court to say Kibaki could not be sued for refusing to pay his debts!
gross violation of a provision of this Constitution or of any other law;
(b) where there are serious reasons for believing that the President has committed a crime under national or international law; or
(c) for gross misconduct.