A modern hearing aid circuit is a complicated DSP digital chip, not a simple audio amplifier.
The tiny amplifier IC that you found is used in an MP3 player to feed headphones. It is soldered by a robotic machine.
When I solder this down on a PCB. I use solder paste on the PCB, It is like a glue you put on each pad. Then stick down the part. Then the entire board is put in a oven and heated up until the solder milts. So all the pins and all the board are soldered at the same time. (I use a toaster oven)
Cook and bake the circuit to make solder joints?
48 years ago I put car radios in an oven (but not hot enough to melt solder) to make sure they will work on a hot summer day.
Have www.proto-advantage.com procure the IC from Digikey (if available) and make the DIP adapter with the component soldered. They can also supply the stencil for the application of solder paste. A board house may be able to supply a stencil for your entire board. Mylar and metal are common materials.
My son bought a Chinese "Amplified Ear". It was advertised to make distant sounds seem to be very close. But its sound was exactly the same as when it is not used so it is useless.
My son bought a Chinese "Amplified Ear". It was advertised to make distant sounds seem to be very close. But its sound was exactly the same as when it is not used so it is useless.