Bump. I finally replaced my system board. However, in the interim I had an extremely easy and good solution working for quite some time, so I thought I'd share it here. Sorry, no pics, I hope a description will suffice if anyone finds this useful.
Once the reset button is torn off, you need to open the unit to fix it. Find some nice pics and guidelines to do it here
Now, if you carefully follow the printed circuit paths, you'll see that both ends of the switch are (or rather, were) connected to two of the many small holes that pierce the motherboard. These holes have a metallic rim and they are just wide enough to let a fine (hair-like) copper wire through.
All you need is passing two regular fine copper wires through these holes, and tying both ends of each wire around the MB border forming two loops right beyond the 'socket' for the switch button, so the wires don't move. If you press a metal piece connecting both loops, the unit resets perfectly.
After securing the loops I took the ends of both wires out through the case hole that lets the pen in for the regular reset, and glued them to opposite sides of the hole on the outside of the case.
Now, every time you need to reset your unit, instead of sticking your stylus in the hole, you just press any metal piece on it connecting both wire ends, and there you go.