@OH1 - If both these siblings have a ROR for life, then it is on their passing that the rest of you share, so until that happens nobody gets anything. It seems possible that X and Y could renounce their respective life interests and any other interests (eg Y has chalet and dies - X presumably then has a share in the chalet) in return for €xxx for X and €yyy for Y. Clearly if the settlement and the legal fees approach €170k why would any of the siblings agree etc.
I think the value needs to be set by the Group.
If the family agree (and thats the crunch) ..then seek legal advice as to whether it can be implemented ..there could be tax issues.