Personally–I’ve had better results with mixed classes. Couples often attend together; you could even offer a couples discount to fill out the class. A full class always attracts more people; it’s like a magnet for others looking for the experience of a group training session. Good luck, my friend!
personally, I would be more attracted by a self defense/fitness hybrid because it is unique. Bootcamps by now are getting more popular but this is a novel idea that I had not seen before. I think it is a great idea to set yourself apart.