Not knowing much about Deki Wiki capabilities, I am going to assume you want the two to be separate from each other, unlike our MediaWiki integration, where saving files thorugh mediawiki stores it back to Alfresco repository.
I would suggest writing a web script that can accept the wiki page, store the page inside AVM, and kick off a workflow as a possible direction.
Are you looking to manage files in Deki-Wiki and then put them into Alfresco WCM?