I have two sets of chainrings that I would like to use on the same cassette utilizing the same chain. One most of the time, the other on occasion---provided it will work.

The main set is 52/38 with a total capacity of 32, the secondary set is a 56/44 that ends up needing 30. (Cassette is 12-30)

The RD is a 105 short cage (RD-5700) that Shimano shows "33 or less" for a total capacity. Will it handle both gearsets with one chain? I usually use big chainring to big sprocket + 2 links to fit a chain (per Shimano tech docs), should I fit the chain with the 56t or 52t ring? Or, measure for each and split difference?

Or, should I use one chain for each?

Thanks, Greg.