I use Discord and I would be ok with that, I am just worried that it would be just endless IM discussion. I think I would prefer something in QA kind of format so that whatever we find could be useful for someone else later. Sort of Mimblewimble knowledge base, like our own StackOverflow.
I have received some donations for Grinventions and I intend to use those funds only to pay for project related expenses. Perhaps I could get a server and install one of the above softs for our Mimblewimble knowledge base.