Apparently, there are some alternatives:
# Disable the AMD GPU at the firmware level ( DosDude1 - http://dosdude1.com/gpudisable) which will force the machine to use onboard intel graphics. I’ll be trying this myself in the next few days.
# I’ve read that someone has successfully replaced the entire logic board with one taken from the 2012 version, which is very similar if not identical from a replacement perspective. I think this model did not have this defect, but I’m not sure.