Dias Ex Machina
Publisher / Game Designer
I'm not sure that is a concern. Specifically, if you don't directly include the material, its AOK. That's how the 3rd party character tools are getting around the GSL.
You should email WOTC though, or post in the GSL forums.
Just using Essentials for eChan characters is fine. I don't even think you need to mention it.
Putting your Echan equipment in a character generator database is also probably OK. Races... Hmm... All yours are new, so I think you're fine there.
Well, we attempted over the weekend to create Essential builds for techan classes. In the end...it was a resounding success. It does require referring to Foundations for some powers and features (something we may address in a "special edition", if it were to be made) but I was impressed how cool they came out. So yeah, they are going in the next book