When a user or bot makes new topic or Flow board header on empty page, Flow checks the flow-create-board` right before making the new page a Flow board.
HostBot owners will propose to Bot Approval Group the addition of the fllow-bot usergroup to HostBot for purposes of facilitating the Co-op project. We will link that from enwiki's Village Pump Technical for visibility. HostBot has been through this process five or so times already and should be familiar with the requirements on their end.
(Since this is only creating a Flow board where non existed before, Flow does not consult editcontentmodel, the right to change content model. When we have a Special:Flowify or Special:Flownomore to change existing pages, then editcontentmodel will apply.)
Trello card: y2bOSmQO