I'm not, but I have a system that will do something similar: I target 70%stocks, 30% cash. If it gets to 60-40 or 80-20, I buy or sell enough to get back to 70-30.

Since I started investing in 2012, I've only ever triggered a rebalance through putting in more cash, but I'm making a list of stocks I plan to buy if my portfolio goes outside that bound.