Yes, as far as I know, he would not accept any other penalty, because he did not plead guilty. If he was not guilty, he did not have to be punished, even if it was a lesser penalty. Accepting guilt, for him, would be like lying, and that is something he did not do. It also would be like contradicting the whole philosophical life he led.
I am now to translate some of it into English and will provide you with it, if you like.
That would be great, if it's not too much trouble.
Thanks to you for stopping by!