Or you can do what I do and just tell him to drop the weight and assume the position.

Actually I am slightly serious. Back when I used to make golfclubs, I was always loath to make some kind of kluge, particularly for the still physically able player who could just take that whack-a-mole swing to the range and get some help for it, rather than have me make him some drastic compensation in the clubs themselves. But if a person is physically disabled it is a different thing. Partly because if they are able, then they will likely be doing something different soon enough, and the whole set will be useless to them. Not to say there is anything wrong with your client...