Presenting the idea of a PhD research project before publishing it
I think this is a good idea. There are many conferences in which they invite exclusively the Ph.D. students in different domains to a co-located workshop. There the students present their work (so far) and get comments and feedback. Further, there is a chance of getting collaboration by senior researchers. 

Have a look at this: https://www.eurosla2019.se/programme/doctoral-student-workshop/