Ed, The congregationalists could have used you at the Westminster Assembly.
They objected, among other things, to the assembly's third proposition concerning presbyterian church government ("the Scripture does hold forth that many particular congregations may be under one Presbyterial government"), which they proved by the instances of the church of Jerusalem and at Ephesus. The debate papers that passed between the congregationalists (aka dissenting brethren aka Independents) and the assembly known as the
Grand Debate, contains their objections (
Reasons of the Dissenting Brethren against the proofs from the instance of the church of Ephesus, submitted to both houses of parliament, 12 December 1644) and the assembly's reply (
Answer to the reasons of the dissenting brethren against the instance of the church of Ephesus, 13 October 1645). To expand on the reason for the proof of Acts 20, here is the assembly's "Instance of the Church of Ephesus":
"That there were more congregations than one in the church of Ephesus, appears by
Acts 20:31, where is mention of Paul’s continuance at Ephesus, in preaching for the space of three years; and
Acts 19:18,
19,
20 where the special effect of the Word is mentioned, and verses 10 and 17 of the same chapter, where is a distinction of Jews and Greeks, and
1 Corinthians. 16:8,
9 where is a reason of Paul’s stay at Ephesus until Pentecost, and verse 19 where is mention of a particular church, in the house of Aquila and Pricilla then at Ephesus, as appears, chapter 18, verses 19, 24, 26, all which laid together do prove that the multitudes of believers did make more congregations than one in the church of Ephesus.
ii. That there were many elders over these many congregations as one flock, appears,
Acts 20: 17,
25,
28,
30,
36.
iii. That those many congregations were one church, and that they were under one presbyterial government, appears,
Revelation 2:1–6 joined with
The directory for church government had been submitted to parliament a few months earlier in July. I forget the reasoning why the answer on Ephesus was so tardy in coming but may have been due to all the work and the desire to accommodate the congregationalists if at all possible and maybe that put off the formal answer to parliament for nearly a year after they had answered objections to the instance of Jerusalem. See
The Grand Debate (Naphtali Press, 2014), pp. 175-204 and Van Dixhoorn,
Minutes and Papers of the Westminster Assembly (OUP, 2012), volume 5, pp. 3, 5, 250-251.