Okay, so I failed thanks to household expenses. I believe that, in theory, one should be able to paint the normal face into Super Saiyan to give us the straight-on angry face. The same would apply to the Super Saiyan faces to give the normal head more faces. Simple, right? Wrong. You would actually need, at most, three Trunks figures. One for the normal-to-Super conversion, one for the Super-to-normal conversion, and one to compare the colors to, if necessary. For now, it's just a theory, like my SSGSS Goku theory I'm thinking of. I'm too scared to do it myself because I've never had very high grades in art classes throughout school.
Edit: Um... Branjita ? This one might be in the wrong thread, but I'm not sure. Please help!
One solution for normal faces could be to purchase the upcoming Xenoverse Future Trunks and another solution for Super Saiyan faces could be Dragon Ball Super Future Trunks as well. That, of course, is if Tamashii Nations makes everything compatible which I honestly don't see why they wouldn't.