Being a 'Shimano guy" I know this may sound crazy - but how about doing an 'upgrade' to the NX Eagle 12 speed groupset. I guarantee it will not break the bank. The 11-50 works on HG freehub bodies and all the cogs are steel. In regard to the chain, the main problem seems to be availability - but I have 500 miles on my Trek Rail with zero stretch so far.