Unfortunately, digeridoo playing is just as disruptive to partner's sleep as snoring is. Perhaps they should try bagpipes?
The didge forces you to learn circular breathing, it's cheaper, it is easier to learn, and is easier to play well. Plus I think it sounds better. Everyone should learn to play the didgeridoo. Bagpipes are a whole another level, and feel more like a practical joke gone horribly wrong (Sorry Gran.)
In the case of the Great Highland bagpipes, the most similar traditional instrument is the rauschpfeife (capped double-reed with conical bore and without prominent bell):