In this podcast, Dennis, with the backing of our Greek New Testament Grammatical Commentary database, shows that Nestle-Aland μενοῦν is an illegitimate compound of μέν. It is not the original word in Luke and violates the absolute postpositive prohibition against the initial position.
Luke 11:28 [Byz μενοῦνγε]
αὐτὸς δὲ εἶπεν
Μενοῦν μακάριοι εἰσίν
οἱ ἀκούοντες τὸν λόγον τοῦ Θεοῦ
καὶ φυλάσσοντες.
Then he said
Blessed indeed are
those who hear the word of God
and keep it.