I have a work ready to publish with good results and proper mathematical arguments to justify it. I liked to try top conferences like ICML, IJCAI, CVPR, ICCV ... which are related to my field (machine learning and vision), but their deadlines are already passed or not reachable.
My supervisor has the idea of sending extended version of the paper (with extra mathematical proofs and experiments) to a top journal like JMLR or such.
But i'm not sure if it is a good idea, because it may take 6-8 months until i get the review and revise it and maybe 1 year until it gets published if they accept it, and my PhD will be finished before that!!
What if i send the paper (small version) to a medium conference which has a deadline in a month from now and also sending the extended version to a top JR? But i'm afraid by doing that i may undersell my work to medium quality expectations.
1- Is it allowed?
2- Is it a good plan?