In prewar Warsaw there were wives who R”L were at the movies Friday night while their husband was home making Kiddush.
According to Mr. Rebbetzin this would suggest that a shidduch between a Yeshiva bochor with a girl who goes to the movies on Shabbos is a good shidduch to redt.
The bottom line is that the shidduch in the OP is no different than the idea of a shidduch between a Brisker bochor and a girl who is a member of and prays in a Conservative/Masorti synagogue.