And, regarding the 2 pin / 3 pin discussion ... my 2702 works clearly also with tip with two contact. I have one aoyue tip with 2 contact only ..... so, it can manage both type of tips. But now I wonder how he keep temperature under control ...
That link I gave you, guy says T12 just works with his station no mods, and his station has 2 contact aoyue tips. So if 2 contact aoyue tip works with your iron, then chances are no mods will be required. As far as 3 contacts, I think they made it because of legal issues so that it wouldn't be that readily compatible with Hakko. Legal issues plus monetary issues, selling tips are money.
Now I did disassemble my iron. There are 5 wires, 1 and 2 are together, 3 and 4 are together, and 1 green one just connects to chassis inside station. So thermal resistor most likely is in series.
Here, I ordered tips real cheap, shipping is about 20 days. Try it, if need to mod iron, then get a new iron
https://aliexpress.ru/item/1005005971901133.htmlI also seen aoyue iron on aliexpress, about 20 bucks.
You could also get a T12 iron instead of aoyue iron. But then there would be issues with stand and I think aoyue has a quality iron.
On a side note, lately I've been seeing aoyue stations like mine and yours being for sale real cheap on free ads sites. You can buy a used station for about 50 bucks. Technology is getting old. Even smallest tip is not small enough. There are better stations today. Pretty much everyone upgraded their Hakkos, Louis Rossmann, iPad Rehab, STS Telecom, and other youtubers. T12 is rarely seen in repair videos these days.