In my State any vehicle 20 years old or older can qualify for collector plates which don't require annual tabs, and the one-time plate fee is reasonable. Almost everything I have qualifies. However you have to declare a "primary" vehicle that is subject to annual tabs- no way is anyone going to get out of driving around without paying every year. That's fine, I get it.
I don't drive all of them all the time. Luckily my insurance company allows me to suspend policies for quite some time before I either have to re-activate or cancel, which is no big deal. So the ones I drive get insured but basically only in blocs of time when I'm using them. I declared the F150 to be my "primary"- the one that has continuous coverage, as for some reason it is dirt cheap, far cheaper than my little cars.
The others then come and go as they will.