Looking for help optimising this trip. Ideally we would get silver from this one journey. At the moment I think this is 40+140+40+40+140+140+40, which is pretty close, but can I do better?

I can't work out how to add in a transcon on the way out -- the only options appear to have long legs in Y (I can't do long flights in Y due to back issues -- must have big recline or ideally flat bed for anything over a couple of hours).

Could I add another hop in Europe, or start somewhere in Europe that gives 80 instead of 40? What other suggestions might you have?