Personally, I wouldn’t do it. It depends, if you always shave and never wear your beard, then I guess you wouldn’t miss it. But I would not exchange my beard for hair on my head.
Also, the hair on your head will look like beard hair. There’s less blending with scalp hair. Beard hair works best when mixed with at least 70% scalp hair. Out of 10,000 grafts, only 3,000 from beard looks best. This will make it so the beard hair is almost undetectable.