To my knowledge, there’s no list of “Germanic-heritage” schools (they tend to be located in the Midwest or Pennsylvania), but in practice such schools often have Lutheran connections. And there is a list of Lutheran-affiliated schools: https://lutherancolleges.org/the-lutheran-experience/a-liberal-arts-education/
St. Olaf College (in Minnesota) would be one of the top picks on this list (although their heritage is Norwegian rather than German). St. Olaf is also one of the “Colleges that Change Lives”, which is basically a group of academically strong liberal arts colleges that are not super-selective: https://ctcl.org
It wouldn’t surprise me if some of these schools had special scholarships or awards, endowed by German-speaking alumni long ago, for German majors.