Oh my....
I really dig what you are trying to do, but that 1 x 3 set-up needs binning:
- Front changes under heavy load are dreadful, it you so happen to be caught out in surprise territory.
- I have never broke a chain with a rear change, only front.
- Hell, you are almost lugging around half a rear mech as it is....
Double up front, fairly wide at the back. Take a leaf out of some tourers, and just specify your two front ring sizes based on the
strength of your legs, terrain, and bike. Typically, only a 10T jump at the front is about equiv. to three sprockets at the back; nothing
to stop you doing a 14T jump at the front with most FDs.