Your main likely has enough of the new currency to buy all 3 missing citrines and simply mail them to your alts (they are warbound) or put them in the warbank for your alts to pickup.
It’s dumb that you have to “unlock” citrines on alts, but that’s what’s currently in place, but there’s a workaround if your main has enough currency to just buy them for your alts. Also (I guess for mains), all the gems will become immediately available Soon™ rather than be spread out over weeks.