Yeah, old age presents timing problems for people and bikes. Problem with just starting it up every week is that if you don't let it get really hot, by riding it around, you'll get condensation in the pipes leading to premature rust out. Gotta get the exhaust hot enough to burn that out.
I've had a budget of time for bikes for the last many years. Riding, working, or combo. Its pretty fixed. If I'm working on one a lot, as I have been the others get neglected. And my riding skills diminish.
Stabilizer, trickle charger, and only start it when you're going to use it is my approach. Change the oil seasonally regardless of use.