The statue dedicated to a 6th Century Irish saint is falling apart.
Police say the offenders could face jail after fences and signs at a little terns nest site were destroyed.
The Scottish government initiative is being rolled out across the Highlands and Islands.
Three officers are receiving tuition and the training has been offered to others based in the Western Isles.
The facility at Arnish is one of four in the Western Isles operated by SSE Distribution.
A study suggests islanders want to see upgrades and better accessibility to some sites.
Comhairle nan Eilean Siar says some work around the delayed project can now be progressed.
Transport Scotland says it encourages people with "lived experience" to join the public bodies.
Comhairle nan Eilean Siar says it supports the idea of fixed links over the sounds of Barra and Harris.
