Swedish dip (snus) is cooked over 1-3 days around 90C (below a boil), often in a slow cooker, or a specially made oven, and this is said to give good flavors. Even without kilning the leaf, first.
I haven’t tried for that long of a time, but it’s said to give a good flavor, and it does stop the production of carcinogens in their stuff.
Snus makers are trying to get into the US market now, and they have a lot of scientific studies to back up their claims of lower cancer rates- especially compared to American dip/chew.
I’ve either kilned my leaf, or settled for heavy flavorings to hide off tastes from green leaf. I haven’t tried taking unkilned leaf, and slow cooking it for a few days to see what the flavor is like, but it’s definitely worth a try.