I guess so. Some people have talked about coating their mouth with some sort of gel beforehand. Although, I would worry it would mix with the SN going down.
I think the problem with things like cola, fruit juices, wine is the acidity- breaking the nitrite into nitrate faster. Maybe it's ok held in the mouth without swallowing but, I'd be nervous to risk it. I think SN is supposedly so strong too. I don't know how well it would even mask it afterwards.