Yes you can do it,
But what hair would you be enhancing with?
I've never seen Afro stick tips
I suppose if the hair has been relaxed, the best thing would be to get Yaki on a weft and tip it yourself
Then as the rings grow down with the hair, instead of moving them up, you'd obviously have to remove them, and relax the roots, then re fit.
Plus I know alot of people with Afro hair use alot of oily products, which will make the rings slip
So yes, physically they can be done, bit like with any method for any client, it's a matter of weighing up the pros and cons