Apply eternal patterns to add-on gear

I think that we should be able to apply eternal patterns to add-on/crown store/reward/pledge gear. Doing this should return the other eternal pattern and simply change the piece into the piece that the pattern came from. This would solve two problems:

• You could have heraldry showing on a piece of gear that is indestructible and unlootable.
  
• You can essentially restore a piece that was inadvertently salvaged.

As an example, lets say that I accidentally salvage my founder bow. I could purchase any longbow from the crown store, apply the founder bow eternal pattern and now I would have a founder bow and an eternal pattern for the bow that I just purchased from the crown store. Doing this with an eternal heraldry pattern would do the same thing but also apply the heraldry.

What do you think?