Might the context of 1 Tim 2:12 be affected by when it was written? Consider...
The Letter we call 1st Timothy was most likely handed off in person, from Paul to Timothy, at Troas (Acts 20:6, at which point Paul must have said something like, "Kid, you got one week's head start. I'll call for the elders near Ephesus.") If so, that means the circumstances Paul wrote about had been causing Timothy problems since Paul left Ephesus (Acts 20:1, at least a year earlier than 20:6, given that Paul went to the Adriatic and back; Rom.15:19, Acts 20:2). It also means those problems probably took root and existed 'under the surface' while Paul was still at Ephesus.
One thing we know for sure about Paul's time in Ephesus is that he was there when Claudius died (Oct, 54 AD). Claudius had to die before Paul's comrades could move to Rome, before Paul could write them a letter (Rom.16). Therefore, it was during Paul's time in Ephesus that his associates from many cities (on whomever's initiative) began moving towards Rome. One of those many was Junia, a female apostle (Rom.16:7).
We don't know where Junia was from, but Jerusalem and Antioch are common suggestions. In either case, the cheapest, most convenient, friendliest road to Rome - hopping from church to church for hospitality's sake - ran through Ephesus. (There is no evidence of churches in North Anatolia by this time, at all.) Unless Junia was from Greece or Macedonia, she passed through Ephesus. She may even have lived there for a time, perhaps while Paul was teaching his disciples at the School of Tyranus.
I would argue all of that is fairly probable. As far as what follows? Well, that all depends.
Who were the would-be-teachers whom Paul wanted Timothy to rebuke? Were they all male? It seems at least two of them were (1.Tim.1:20), but the charge is unclear (1:3). Nevertheless, if the bad teachers were all men, and they were willing to oppose Paul and Timothy, just imagine what they would have thought about Priscilla and Junia. It is possible these insecure men used Priscilla and Junia as examples of why Paul and Timothy could not be followed. It is further possible that 1st Tim.2:12 was Paul's response to a rumor they started about such women.
Think about this: Jesus spent time alone with Peter. Barnabas traveled with Paul. Paul and Timothy had become as close as father and son. Since apostles were accustomed to taking on trainees, and since most apostles were men, Junia being the one known exception, it would have seemed clear that Junia must either (A) take on no disciples, or (B) take on a male disciple.
Paul's experience with Junia and Priscilla - both before he wrote 1st Timothy - is the strongest of all the evidence showing that he was progressive for his time. If his (probably male) opponents in Ephesus had been opposed to those developments, they would naturally have spent time thinking of all the ways Paul's policies might become dangerous. Had they wanted to employ it, the most damaging charge possible would be immorality.
They only needed to raise the question to cause controversy: "Would Paul allow Junia to disciple a man?"
If that concern was put out in Ephesus, it may be what Paul was responding to in 1st Timothy 2:12, when he said, "I do not allow a woman to teach or direct a man".
Judge for yourselves how likely this scenario might have been. But consider it well...