Its really not.
I mean, if the movie called him "Dick" all the time I suppose I could see the argument (despite the filters you mention) but if someone watches the movie, with Nova being called "Rich" or "Richard" all the time and then Googles "Dick Rider" they're probably not looking for Nova in the first place.
I think that'll happen no matter who Marvel uses; both characters have some solid qualities the film makers could want to use. It'd mostly just boil down to what kind of split it ends up being. Would Nova be more "Rich" or more "Sam?" Because however it plays out, odds are a little of both will be there.