You will need a Mac.
CocoonJS outputs an xarchive file which has to be compiled by xcode to an IPA to send to apple. If you want any proper testing of your app you will need a Mac.
Don't want to buy a mac? Borrow one, build your entire project on a pc, borrow someones macbook for compiling and submission. I got my hands on an old iMac and voila I'm on the AppStore.
I did fall in love and later bought a MacBook and now I can complete the App process from start to finish on one device.