Using evidence in marketing communication related to "Germanness" is a bit like mine clearance work. The distance from success to disaster is sometimes just a singe step. Poor associations may discourage rather than encourage.
Angelique Kerber, Australian Open and US Open champion in 2016. Does anyone dare to use her image in Poland AD 2017? After all, her Germanness is heavily underscored by Polishness.
The risk is great, but there are "German-Polish" creations that have a considerable positive impact on the performance of companies, the best example of which is Opel).