No idea about monitoring something 12V+... what is it? Pelt PSU?
The key with hand soldering qsop is to pre-tin the pads in the manor i mentioned. if you're going to try to solder small wires directly to the legs of the chip: let me advise you against that, heartily. The adapter is worth it if you're going to make a 1-off device.
I could put down a 1668 (QSOP) onto the tinned pads on the boards I made in about 20 minutes/chip (including testing)... doing the wires by hand took me close to 4 hours. 3 housr and 40 minutes is worth $8 to me