I think it would be nice if there's a plugin that would just automate crafting a specific type of rares and then convert them to legendary, and continue to do it until mats run out.
in trinity, select what rares you'd like to upgrade, then just precraft a bunch of those rares and then turn bot on, itll auto cube them during next town run. Nice little work around.
A good tip is also to keep crafting materials in your protected slots. This way when your backpack is full it will not salvage all your yellows before it converts those parts you have sellected to legendaries.