Okay, this I can answer. While I was looking for my own answers I learned that after a full infibulation a g-spot orgasm is still possible (That's going to come up in later chapters of my current story 'Hell To Heaven' in the Library's update page) In fact, a g-spot orgasm is the only one possible.
A good slave, one who obeys his/her Master/Mistress out of love and devotion and loyalty, will not give him/herself an orgasm if it is against the Master/Mistress's wishes, (at least if I were a full-time sub, I wouldn't.) So the Master/Mistress is already in control of his/her sub's orgasm, via invisible remote control. And if the Master/Mistress truly cares for his/her sub, and feels responsible for the sub's well being, They probably won't risk the sub's health for something so permanent and painful. After all, isn't watching your femsub writhe and gasp and cry as you torture her poor clit worth it? And if she does disobey and give herself an orgasm without your permission, isn't punishing her for her naughtiness fun?