So, this website introduces Chess 744 and addresses the confusing castling issues of Chess 960. Basically, we removed the Chess 960 setups with rook and king in a corner and then used the exact mechanic from standard chess. Rool moves to king (if not already adjacent) and then king swings behind the rook. Here is the site - along with a designated setup for each calendar day.
https://sites.google.com/view/chess-744/todays-744-game