I don't understand this. Why wouldn't you just practice by interviewing with random companies? If you are hired, just counteroffer with an absurd salary requirement. And if they accept, then congrats you don't need to practice interviewing anymore.
I did about session a day for maybe two or three weeks. I'll compare it to trying to practice by doing real interviews. I got much more detailed and honest feedback from my practice interviews than any real one I've had. I got to practice just the interview type I wanted, algorithms, without doing other things that would come up in a series of interviews (culture, system design, etc). I also didn't have to contact and coordinate with >= 10 companies to get 10 sessions. I just booked 10 sessions.