Hello @Hassy - nice to hear from you again!
Is it possible that someone registers a car and pays for insurance while someone else uses it. But the person that registers it will have to tell the insurance company about every single person that will be a driver (otherwise he might get in trouble if a non-listed driver causes an accident). If there is external people on this list (for example non-family members) the insurance contribution will be higher.
So if you find someone that is willing to make such an agreement with you, go for it.