You can compress and smoke tofu, it works well. You can smoke seitan 'sausage' and it will take a light smoking well. Almost all meat substitutes will not take a long cook, as they have a lot of moisture and once that is gone, they are hard to enjoy.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."