Speaking here as a Doctor the medical paternalism of this post may immediately disqualify My comments from some on this forum who have a tendency to aim to hack their own bodies the way they hack technology. So I apologise in advance should that reaction occur. However.
There are elements of your relatives case that make adequate commenting very difficult.
For instance, what is their age, what is their leaflet anatomy (bi or tri leaflet), what is the valve area, and is there calcification of the aortic root and what is their NYHA grade.
Aortic stenosis is a condition with high morbidity and mortality if untreated.
Elderly patients can do quite well depending on leaflet anatomy with transcutaneous aortic valve replacement (TAVI) - this is preferred for more elderly patients because the replacement valves don’t last as long as tissue or metallic valves (which last from 10ish to 30ish years respectively).
Due to the high morbidity and mortality associated with it, really the best thing your relative can do is listen to their cardiologist and cardiothoracic surgeon.
No-one really wants to have a zipper or go on bypass and it can be quite confronting but hunting down unproven miracle cures for a procedure that is exceptionally routine and has generally excellent results for patients with minimal comorbidities is a fools errand in my opinion