This is retarded. Swedes, Faroese, Germans, Frisians, Dutch, ancient Goths, etc. all currently fall under the term "Germanic". Das Deutsche Reich had "Germans". Nobody mixes up "Dutch" with "Deutsch". If they do, they aren't worth your time anyway, sonce they are complete idiots. So I don't see a problem here.
Also which German Reich are you talking about? You would then have to include all the Czech, Poles and French sitting in that territory now, which only would lead to more confusion..