The off-the-shelf ones seem either the easy way round,small to large, or
too bulky.
I've about the space of 3 DIP16 stacked on top of one other to play
with, after removing and replacing a large choke, for access purposes.
Existing pads are for SOP-16 but only DIP-16 ICs available.
At the moment I'm thinking 16 short lengths of thin plain tinned copper
wires soldered to the pads. Thin short sleeves over every other wire.
DIP-16 glued in place over the original site and then the 16 wires
soldered to the DIP16 pins.
I tried ,as a test any old DIP16 chip, bending and splaying the pins
to engage in a .05 inch , SIL,header socket . That would work , just,
but unlikely be able to compress those lines of pins widthways, as well,
for the width of SOP IC pads and still line up with the pads.