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K2 was supposed to help endothelium as well and was known for enabling calcium to move from blood to bones.

Magnesium seems like a better guess and seems to not have been studied for aortic stenosis though it does help with vascular calcification.

Especially since heart murmur is a symptom of aortic stenosis and magnesium is critical to regulation of the heartbeat.

Which magnesium type? Oxide, glycinate, threonate...?

My recollection is citrate and glycinate are bioavailable.

I was taking reasonable amounts of Magnesium (SlowMag) daily, however it seemed to trigger muscle twitches and fasculations after a while. YMMV

I don't know what you mean by reasonable amounts daily.