Update: After offering the Iconians their revered homeworld for - a - single - Elerium, the Iconians laconically accepted the benevolent offer, answering just... "Fine." Didn't even get a single plus for the diplomacy screen. Oh the ungrateful bastardos!
In any case, after they got settled back to their original planet, Yor promptly invaded and now the Iconians are without their homeworld. Again.