I think this is exactly the right approach. Let people invest in BTC, Doge and such, meanwhile develop a strong eMark, that can live up to the standards a currency should have. Starting locally/national sounds smart, to build a solid ground.
But I still think it would be better to just call it eMark(EMK) and let it take whatever direction it wants. Since Mark is from the German dictionary, that shouldn't make it feel less 'personal' to the German population. (In contrast to DEM)
My 2 cents,
Greetings from Sweden