Tools: flux paste, fine kynar wire (30AWG), hot air at 280C, microscope (or 10x loupe), UV-cure mask.
Steps:
- Clean exposed trace with flux brush + IPA
- Tin trace with thin solder, ~1mm exposed copper visible
- Solder kynar wire to trace, 2mm long
- Bridge wire to the SMD pad location (now floating)
- Place component, reflow with hot air
- Cover with UV mask for mechanical strength