Thats the woman I talked to on whatsapp, Dr. Arika.
She said something along the lines of you need a ratio of 1 to 2 scalp to beard hair grafts.
Doing beard hairs alone looks unnatural, so you have to mix scalp with beard hair grafts.
So for example if you wanted 3,000 total hair grafts for your crown, you would need about 1,000 scalp hair grafts, and about 2,000 beard hair grafts. Of course this is gonna vary amongst patients depending on graft thickness, colour contrast.......etc. But thats about the average.
Also keep in mind your beard hairs are almost all singles and a few doubles, but no triple or quadruple grafts.
However your beard hair is approximately twice as thick in diameter as scalp hair, so that helps a lot