I understand it means an extra burden for all; but to me, voluntarily doing something challenging together for a family members' benefit seems preferable to facing each adversity largely independently.
As an aside, while likely much better than uncontrolled, 6-7% A1C still seems on the high end for lifelong. You probably already know this, but exercise immediately after carbohydrate consumption can also help - e.g. family walk after dinner (another thing my partner isn't interested in)