Actually, I am using a reflow/toaster oven for this project. I only recently made the switch.
The lone AB1815 SPI library on github doesn't come with an example script. However, both of the I2C AB1805 github libraries for the AB1805 do come with example scripts.
So... I soldered an AB1805 onto one of the boards, ran the dantudose I2c example script, and voila, it produced the expected output:
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Although one could do more extensive tests, I think that's pretty solid initial validation that the PCB Breakout board works.
Project complete. :)