Regarding the aroma of antler and horn.
It is my thought that as long as the dust cannot invade your nose, the aroma will not either. Hence a good dust filter is required.
For health keeping reasons, anytime you are working with horn or antler, you should protect your lungs.
I always wear a good dust filter while I am in the shop, regardless of what I am doing. When I turn on the power sanders, I also put on an Air Stream dust helmet which not only features a clear face shield, it also distributes a positive atmosphere of filtered air in front of my face.
So, I really do not smell anything while I am working, and I work in a rather small, enclosed space.
You really do not want any horn dust or antler dust to get into your lungs - it causes some not pleasant results.