As you’ve already moved your power centre to the west, move the relics there too.
Leave the relics well alone. They are sacred and should remain on the island. Hopefully the Vikings will leave Iona unharmed out of respect for St Columba.
Which card should you play?
Burying the relics is a bad idea. As well as being disrespectful to St Columba, it is important to your people to preserve his memory and relics. He is the patron saint in whom the Scots place their trust. They believe he will protect them.