Sounds reasonable, but does see limit the users in that group from being able to edit a post if it is a Discourse Wiki post?
By Discourse Wiki I mean any post that has been converted to a Wiki so that any one can edit the post and gets the 
icon added at the end.
I tried this and here is what I found.
Our current permissions for Category: Wiki
When changing permissions to
my trust_level_1 account is not given .
It was a good idea but did not work.
Did I test it correctly?