I don‘t think anyone is annoyed that the thread has been revived. I personally think that it is a good thing. I:m not that electronically skilled but do understand a lot so I am curious how your port goes. Keep us updated.

If you are good at soldering, it is perfectly reasonable to attach a 30 AWG wire to that pin. But we are talking professional soldering, and using something like a fine tip Metcal or Weller iron. Something I wouldn't hesitate to try myself, but not something I'd suggest unless you solder a lot in ...

Just use an Exacto knife to scrape the soldermask off. Then solder a wire to the exposed via pad. If you can clean out the hole (for the via), you can solder a 30 AWG wire into the hole, but I'd suggest just scrape the soldermask off the surface and don't try to clean out the via.

But the bigger ...

That's an awesome compact adapter you've made Snufkin. I might copy your idea.

After giving away my Teensy (built a birthday present using it) I only have a Pololu A-Star 32U4 here. The PB0 isn't broken out, well not to a readily usable extent. Does anyone know of an easy way to remove solder mask ...

(OK, I retyped this after comparing the schematics myself.)

The schematic for the Teensy 2.0 board can be found here:
https://www.pjrc.com/teensy/schematic.html

I compared the Teensy board vs. the A-Star 32U4 Micro board you mentioned, and they seem schematically to be the same. The A-Star does ...

I live in England and am finding it a bit hard to source a Teensy 2.0 that is affordable or that I don't have to wait 4 weeks to receive.

I assume you can use other Atmel32U4 Dev boards provided you wire up the components correctly if the board has different pin assignments/labels to match the ...