IMHO, the ecclesiology reflected in the letter the Ephesians is entirely consistent with the well developed view of the institutional church reflected in the writings of Ignatius and Clement of Rome, both of whom knew Paul personally, writing +/- 30 years after Paul’s death. That being the case, I think the burden of proof that Ephesian’s ecclesiology is too developed to reflect Paul’s thoughts lies on those who would assert the church’s views changed radically in the half generation between his death and these very early writings by his contemporaries. I have never seen any serious attempt to make that case. On the contrary, the idea that this changed radically in that short period of time is taken for granted. What is lacking is not historical support for the early ecclesiology of Ephesians, but the historical support that the ecclesiology of Ignatius and Clement was radically different from that of Paul and the Apostles.
The apostles have preached the Gospel to us from the Lord Jesus Christ; Jesus Christ [has done sol from God. Christ therefore was sent forth by God, and the apostles by Christ. Both these appointments, then, were made in an orderly way, according to the will of God. Having therefore received their orders, and being fully assured by the resurrection of our Lord Jesus Christ, and established in the word of God, with full assurance of the Holy Ghost, they went forth proclaiming that the kingdom of God was at hand. And thus preaching through countries and cities, they appointed the first-fruits [of their labours], having first proved them by the Spirit, to be bishops and deacons of those who should afterwards believe. Nor was this any new thing, since indeed many ages before it was written concerning bishops and deacons. For thus says the Scripture a certain place, “I will appoint their bishops s in righteousness, and their deacons in faith.” …
“Our apostles also knew, through our Lord Jesus Christ, and there would be strife on account of the office of the episcopate. For this reason, therefore, inasmuch as they had obtained a perfect fore-knowledge of this, they appointed those [ministers] already mentioned, and afterwards gave instructions, that when these should fall asleep, other approved men should succeed them in their ministry.” 1 Clement 42-44