I just went through this also. As of now we cannot RGH a console on 14719 unless you have a previous nand image and the CPU key. Once RGH 2.0 is released we can once again RGH the Trinity motherboard regardless of dashboard version. Above all, they say it can be done with the current CoolRunner!
In short: Wait for RGH 2.0
ETA? Don't ask, but with the way Team-Xecuter have been going recently it shouldn't take long. They are MACHINES! Thanks TX!!