I love doing and receiving TFM and I use the stick. I've done 2 separate courses so I have devised my own routine using elements from both.
It isn't popular, but if you introduced it at the end of your reflexology as a gift to your clients they may well ask for it next time.
I also put it on as a special offer and do a treatment called
Head, shoulders, knees and toes
In that I do a Eastern head massage with the Thai foot and my clients love that.
It will save your hands as you are doing more massage and can sit for most of it, the stick is fun and easy to use and you use no pressure.
perhaps consider other tools in your massage:
hot stone massage, lava shells, bamboo massage, crystal massage, compress massage. Also look at hands-free techniques.
I use a lot of tools and do a lot of different treatments so that I don't "hurt" my main tools = my hands/wrists.
What might work nicely for you is the Eastern head massage alongside the thai foot, look for Oriental face massage, natural face lift courses in your area.