Hi Daedalus,
we had a group buy for a Zorro-based I2C card (a clone of the original ICY board by Michael Boehmer) on A1k.org two years ago, so we have quite a userbase for Amiga & I2C now. The card works with i2c.library, and now your development covers the "missing" clockport machines for which there were only external I2C solutions available until now.
You may already know these, but I'd like to mention the two I2C-related projects by Henryk Richter:
I2C sensors, a framework which sits on top of i2c.library and already offers support for some of the most common sensors. It is possible to add support for new sensors without the need to code:
https://gitlab.com/HenrykRichter/i2csensors
Sensei - a commodity to display I2C sensor data:
http://aminet.net/driver/other/Sensei.lha