That’s what we have done, my lad is 17 and 3 months and is learning to drive with a instructor, we went halves on a car and it’s registered / insured in my name with my wife as a named diver, my deal with him was when his instructor said he was ready for me to take him out only then I would add him as a learner driver , I didn’t want conflicting instruction in his early learning, he’s now ready for just experience driving so I just added him to the policy today and will be active from this weekend.