Ah so you're intrigued enough to drop the requirement that it contain demon weed or be a Va/Per. Good, good. This is progress.
Now, just a little bit of elasticity on the Aromatic prohibition is in order. If we achieve that then we'll work on a rapprochement with Cavendish.
First all tobaccos (including demon weed) leave their trace in our pipes. So the words stain or ghost are really just value-judgments that are inversely proportional to smoking frequency. Outside our idea of their normal scent, so to speak.
Second, not everything is an American Aromatic. For example the Irish and English were magicians with toppings. And many of the Irish Plugs are good examples of that. They're really quite restrained and only slightly aromatic. After all, what do you think makes them Irish?
There used to be a lot more of them. Today there are a few old names still sold and you should be able to find them:
Mick McQuaid Plug
Yachtsman Plug
Warrior Plug
and from England
Revor plug
and of course a number of Lake District Plugs.
You may be able to find the Lake District Plugs in the US but the other three or four are distributed in the UK only. They're not made in the UK anymore but the current ones are pretty good.
Here's a historical list of what used to be:
http://www.irishstatutebook.ie/1956/en/si/0125.html
Now lest you feel reluctant I must tell you that straight tobaccos are pretty much a myth. Is this surprising?
You don't know the power of the flavoured side.