Yes I agree, there are other valid explanations. We all believe what we believe is valid, so yes, I think my view is also valid. 
However, my view is not “presuppositional”. I have presented many verses for context. My view as I said before is that archas(rulers) and exousias(authorites) can refer to earthly and spiritual domains. In Eph in paricular however- as I read it,
For our struggle is not against flesh and blood, but against the rulers(archas), against the powers(exousias), against the world forces(kosmokratos) of this darkness, against the spiritual forces of wickedness **in the heavenly places.
**
So in the context of the sentence, as well as the context of the epistle, in my view the archas and exousias Paul is speaking of are not flesh and blood, but rather they are** cosmic powers** and spirituals of evil in the heavenly realms…
In my view these are not governors and leaders who have flesh and blood and rule upon the earth among men, altho they work in and through them. To me this cannot really be easily portrayed as presuppositional or unreasonable. It is an interpretation with support from the context of scripture. That is not to say “it is the only correct view”, but imo it is a very reasonable consideration.
John 6:7 When Jesus called Peter the Rock, He spoke metaphorically. When he spoke to the 12 of Judas “and one of you is a devil”, in my view it is no different than saying to someone “You are a lion”. As the lion is representative of a courageous man, a devil is a fitting metaphor for the traitorous, conspiratorial, thieving, two faced Judas. Judas was behaving like a devil, and like the devil- father of lies, author of confusion, seducer and deceiver, etc. The fact that Jesus called Judas a devil in a metaphor doesnt mean there are no devils.
The 12, including Judas, knew the reality of demons, as they were regularly dealing with them, and watching the Lord deal with them.
The fact that Jesus called Judas a devil is witnessed by the same scripture that bears witness to Legion- a hive of spirits that possessed a madman who was whole and in his right mind after they were cast out into the pigs who promptly committed hogicide. John 6:7 is not a proof text against the existence of disembodied spirits which are represented in narrative all over the scriptures…
The reason Paul became so unpopular in Ephesians was because he cast a spirit of divination out of the prophetess of the temple of Diana. I gather she could not prophesy(see unknown things to tell people and impress them) anymore. The narrative says she had brought great riches to the temple by her prophesying…
The Holy Spirit works through us. The spirit that now works in the sons of disobedience is sometimes accompanied by demons.
I see what Paul did in Ephesus as an example of the the Lordship of Messiah overthrowing the kosmakratos and pneumatika tos ponerias in Ephesus, even as He had done, through Paul in Salamis(acts 13).
But Elymas the magician (for so his name is translated) was opposing them, seeking to turn the proconsul away from the faith. 9But Saul, who was also known as Paul, filled with the Holy Spirit, fixed his gaze on him, 10and said, “You who are full of all deceit and fraud, you son of the devil, you enemy of all righteousness, will you not cease to make crooked the straight ways of the Lord? 11“Now, behold, the hand of the Lord is upon you, and you will be blind and not see the sun for a time.” And immediately a mist and a darkness fell upon him, and he went about seeking those who would lead him by the hand. 12Then the proconsul believed when he saw what had happened, being amazed at the teaching of the Lord.
From my point of view Paul was dealing with a man, but the man was dealing with the devil, enslaving the masses through powers, “earthly, psychological, demonic”. He was seeking to turn the proconsul away from the faith because it would hinder his influence and wealth gathering, and I believe he used natural and psychological means to bamboozle people. I believe he probably had assistance “cosmic powers of this darkness and spirituals of evil in the heavenly realms” as well.
Presuppositions exist in everyone, including me. That is why we have the scriptures. You and I just read them very differently regarding this topic, obviously.
It will all come out in the wash 