2 weeks after the the new PEN boss gear enhancement option was released there was a 1 time option to exchange a piece of the converted TET boss gear to the other type if you accidentally chose the wrong piece.
I chose bhegs when I had meant to pick leeburs, I get that was my mistake and I wouldn't complain if no one was provided the option to swap to the other piece. This doesn't help anyone who, instead of letting their TET gear go to waste since it's untradable, decided to upgrade it over the next 2 weeklies and using the attendance reward to get the crystals for this piece.
There really should also be a one time per account trade for an upgraded gear or for 360 boss crystals for the other type for those who made the same mistake but are now set back 3 weeks and possibly a few billion silver because they chose to be proactive and try to recover from their mistake and not let an untradable piece of gear rot in stash. Support has denied the request I submitted as they said it is by developer design and wouldn't be fair to do so. It honestly feels less fair that I get screwed out of 3 weeks for a mistake while someone who makes the same mistake a few weeks later doesn't at all.