If you need propane conversion for special use, that is another story, but you have wrong perception about exercising.
I heard 2000's don't have shut off valve, but owners manage.
I have 3000 EU for 10 years and it sits for 18 months at the time.
Never had to pull the rope more than twice, so never bother to activate starting battery that come with it.
I am just religious about running carburetor dry before next storage.