The hemp seeds contain a lot of oil, it would prevent the beer from having any type of a head. And it would act more like soda as far as the carbonation.

You could modify the starches in hemp seed to smaller chains of glucose molecules (strings of 1 to 3 molecules in length so that they are small enough for the yeast to eat)

Basically you would perform a "mash" on the seeds in the same manner you would for grains through "enzymatic reactions" (alpha amylase / beta amylase) to produce the modified sugars.

Once the sugars are in place you could "sparge" the spent seeds and continue to your hop schedule. So yes it is possible, and actually likely it would work, you just need a way to remove the oil at some point so it turns out like real beer.

That's how we do it in the industry with some adjuncts, this one would be no different.