how about this lets say you grind for like a month to get this fabled weapon and weapon skill. Implementing something like this I think would work, lets say you 100% bond to your new weapon, then after 100% you have the choice to convert your weapon, allowing you to permanently keep the weapon skill. Easier said then done of course grinding time consuming high tier quest would be a must of course to keep the skill, but possible for peps who really want to keep the skill.

just blew you guys fkin minds I know lol ;p