I am glad to have you joining this project :)
You're eighth on the waitlist.
The core idea between the sharing is to help the Steemit community as a whole, we need steemians to spread the word of this platform. Thus if you post in on Weku, Whaleshares or Minds you will spread the word of our particular activity (which I really appreciate) but it will not help the objective of driving more people to the Steemit platform...
Nevertheless, I totally respect you for not wanting to have an account on Twitter or Instagram (and on Facebook perhaps?). It is up to me the task to design startegies through which we can colaborate with the growth of the platform that will benefit us all. Thus it will not be a limiting condition if you don't post on those platforms. I'll came up with something to fulfill that part, you don't have to worry about it :)
Both writing and phonetics will be part of the course material, the timing will not be that of a regular course because the aproach of this project is about learning from all participants, having fun, engaging, and earning some steem while doing so.
Best regards.