Master Wong's Chin Woo school does it. They are pay per lesson though.
http://www.jkwongkungfutaichi.com/lessons.htm
Here's another idea. It would only work if you have some other instructors and/or asst. insturctor. Our school include 4 .5hr private lessons with the tuition. We teach material during private lesson. Practice and conditioning is what the group classes are used for. Much easier cause you are not teaching material to various levels and trying to split your time that way. Instead you can work on fine tuning techniques, and working on conditioning and various drills.