That's what i'm trying to work out as well. I changed the logo into a modifier, and can see two colors and a prime tower in my prepare view, but the sliced file shows only one filament type and no changes. I'm doing something wrong obviously.
OK changed the logo again to make it a "part" and it looks now like this slice will work in two colors and put the logo on the stand as I would expect it should be. If this works I will upload the profile for everyone.