have you thought about putting relics in provinces instead of countries?
pro: they dont disappear and i think there might still be way for countries with relics to do that. contra: new structure to implement...

there could be decisions for armies to move your own or steal items (or even just try while siege is ongoing[defencivness vs discipline, commander stats?]), maybe spyactions

tooltip could show the continent, region, area or province

would it be possible to replace the old asra agate and upgrade the agate to the crown?