You really mean “account-wide-sharable” so you can send it to crafter alts. We all have had that problem. ALL crafters have expulsom on one toon, and could use it on another toon. We ALL have the same situation you have.
I am 100% sure that the game designers thought of this, and decided NOT to design it that way. Why? I won’t guess. I don’t even know HOW to design an award-winning MMO. So my MMO DESIGN opinion doesn’t matter.
How did I deal with this? I used 2 ways:
[1] some crafters needed expulsom, so I leveled up Alchemy as the 2d craft on the same character, so that I could transmute expulsom (alchemy 90).
[2] other crafters used the scrapper. I sent them lots of Tailored or Leatherwork items (the cheapest ones you could scrap)