I picked up new Shimano 5800 52/36 cranks and a BBR60 for them.

My original plan was to get a 46t big ring also for cx, but when I saw the ring costs almost as much as the entire cranks, and realized it would be a pain to swap rings frequently I had another plan: just get another set of cranks in 46/36.

Question is what is compatible? anything with a 24mm axle that fits an external bearing BB? only hollowtech II cranks? would a 6750 crankset fit?

basically I would like to have my cranksets hot swap capable instead of dealing with the rings