Is it worth setting up an Autoentrepreneur Business in addition to 2 small early retiree pensions?

My husband and I are considering becoming resident in France and we both have small early retiree occupational pensions.

I also have my own business in England and will continue working back in the UK every so often.

We are trying to work out the taxes on our pensions and whether the social charges on our pensions entitle us to belong to the French Health System or do I need to set up an Autoentrepreneur Business to entitle us to belong to the Health system.

Any views gratefully received.