ὅπως, originally a relative adverb meaning
a. The adverbial meaning of ὅπως is still seen in its use as an indefinite relative and as an indirect interrogative; and by the fact that in its place ὅπῃ, ὅτῳ τρόπῳ, ἐξ ὅτου τρόπου are sometimes used. By association with the subjunctive ὅπως became a conjunction (cp. μή πως) used with or without ἄν in final clauses (see cross2196, cross2201). On the use as a conjunction in object clauses after
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].