I know several quests give Bind to Account Gear.
Most are chains, and you get the bind to account gear at the end of the chain.
I think the WW gives Bind to Account after you find Arlis and Venn, but those are both pretty long.
Are there any quests you can find BTA gear that are shorter than the WW and single step? Maybe something where you can just repeat a single quest over and over?