1st of all, if You are being in constant threat and You know You "support" the wrong realm, just because it happened to be spammed over You but there is a threat of being killed, wtf won't You move away to a realm that You want to support and receive their support while moving out? You're bashing your head against a wall.
2nd of all and that might please You all, I propose something like this:
- Each Cairn is taking 5 point of damage for each in-game day.
- After 3 In-real days, if cairn wasn't fixed by anyone OATHED and / or living on covering cairn for more than 24 hours, it decays away
- Any player meting requirements can fix each cairn only once for a week
- Player using one of 3 required materials to build cairn, fixes it by 10 points and 5 points for each neighbour cairn (losing ability to fix them in same manner)
- Players who aren't oathed but live on cairn area for more than IRL week, can instead of fixing, damage the cairn to speed up it decay by being able to "throw a rock" once. It's not a crime so visitor buff doesn't apply as well as action is always possible to everyone.
Thus walled of cairn will prevent anybody who has no keys to fix it while still allowing to wall of "strategic points" and forcing somebody to fix it once a time, allowing a couple of hermits to unite and smack oppresors. I'm not sure only how it would work with villages alts.
3rd to larpers, larpy ideas won't work.