I absolutely do the same thing I have 3+ year old C9 in the tank now exercise it in spring and fall few minutes with a heat gun and put it back in storage.I store my Gasoline generator with VP-C9 fuel that never goes bad. Start it once a year. 25 years down the road, no issues what so ever. The little beast has thousands of hours on it now.
Note, I don't run it on VP-C9, for that I use regular fuel. It is easy to run it out when done with it, and put in the VP fuel.