Alright, after toying with it for a few days I have cracked dual booting and decided to write up the steps myself.
YOU WILL LOSE YOUR DATA DOING THIS.
Credit to @order#10248 for proving the concept.
First thing you will want to do is re-flash stock android on your phone. There isn't an official repo for this yet but @Waxberry has kindly provided one on this post.
Download and extract the files from there and run the script fastboot_all.bat or you can download my modified linux version flash_all.sh.
While that is flashing, download the latest version of Lineage here. Yo