The Chair can (and will) declare him out of order anytime he deviates from the script they want to follow. The judge and the prosecutors are the same people and will change the rules anytime it suits their purpose. I expect lots of “Answer yes or no” questions. If he pushes back, they will find him in contempt and use it as a basis for another impeachment. No way this goes well.
The only exception would be if he can use this to further expose the corruption in the Democrat prosecution against him while falling on his sword to allow someone else to benefit in their presidential run. But I don’t see him thinking that way.
If they do that then they will look like fascist dictators to everyone, even their base..................