Seeking a creamy/melty Swiss Cheese commonly available in the US
I had to look this up. It turns out that Swiss cheese is an American term for what Europeans call Emmentaler cheese. 

This cheese is characterized by the large holes created late in the fermentation process. As Wikipedia mentions, the byproducts of its special fermentation, acetate and propionic acid, give it its typical taste. This means that you can't harvest it early when it's still soft and creamy - if you do, it won't have the holes or the taste. So, there is no creamy variation with the same taste. To confirm that, even the cheapest versions are quite firm and non-melty, as opposed to other cheap supermarket versions of semihard cheeses, which are very young and soft. 

If you want funk, you can use a soft cheese with a funk. A Tomme de Savoie, or a semihard or soft member of the red mould family, for example Tilsiter or even Limburger, will give you lots of odor. I don't know if they are exported to the US, but if you ask the cheesemonger for a substitute, they will help you easily, I hope. 

The other possibility is to process Emmentaler with gelatine in the Kenji way, http://aht.seriouseats.com/archives/2011/09/the-burger-lab-how-to-make-super-melty-cheese-slices-like-american.html As any processed cheese, it melts perfectly.