Dear SE

Recently one of my friends decided that instead of pursuing an Nirvana, he would like to change the weapon he wanted to develop for a Mythic Weapon.

He tried to see if anything would needed to be done again, like Assaults or Alexandrite. If he were to change his mind and pursue another weapon, he didn't want his progress (especially the 12M+ in gil) to go away.

After looking at various forum threads/wiki we were unable to find an answer. So my question is: would trading a different weapon to Abuhquah in WG result in my friend losing all Assault Progress, and any Alexandrite turned in previously?