This is fantastic. I want to build blinky.
You may want to try adding a new sensor onto the S3A7 IoT Fast Prototyping Kit. @jcasman has the Sensirion Grove sensor used in the tutorial below.
It could be a path forward to connect the pH sensor you were talking about earlier.
The key part seems to be in
err = g_sf_i2c_device3.p_api->open(g_sf_i2c_device3.p_ctrl, g_sf_i2c_device3.p_cfg);
err = g_sf_i2c_device4.p_api->open(g_sf_i2c_device4.p_ctrl, g_sf_i2c_device4.p_cfg);
Maybe he can loan you the Sensiron Grove sensor module.
Seems like there's many options to learn now that we know how to do a few things with e2 Studio and Synergy. BTW, it took me a long time to figure how to import the zipped file too. Like you, I unzipped the package initially. I think we're all encountering the same errors with versioning of the Synergy libraries, importing the zipped archive files, and getting the BSP (Board Support Package) into e2 Studio.
The sensor is only $12, but as it's similar to the existing sensor in the S3A7 IoT Fast Prototyping Kit, you may not want to buy it. Jesse may be able to loan you one for the tutorial if you're interested.