I have a few boards saved for something unknown. Have whittled some bass into a wooden scabbard. No kuksa though.
One thing for sure it wood be pleasant work. With your talent a good chance for some exterior relief work if you wanted to

I feel like getting a good drying oil deep into the wood, along with some firm burnishing it wood make a nice useable cup. Maybe not a workhorse, or a fancy grain eye dazzler ( a good reason to add decorative carving)