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Region: The Thaecian Senate
Thank you for sponsoring me Mr Senator.
Haut Conseillers represent one member region, meaning each region can choose their own way of nominating one. Considering the nature of Consortium (alliance between regions oriented towards interregional matters, so imagine the representative like a substitute to the MoFA or a diplomat to a certain group of regions) however, I would argue it is best if the executive retains control over such action. In the end, whatever the representative says or does would be the MoFA's prerogative (as constitutionally only they and the Prime Minister have any authority over Foreign Affairs). The representative is in no way like the one we used to have to the Regions Assembly, especially considering the fact any sovereignty violation is nonexistent.
As for the Grand Conseillers, they only bear advisory power. Their job is not to represent a region but to assist the Haut Conseil. It is worth noting every grand founder of Consortium (people who have done most of the job in helping make the alliance a thing) are Grand Conseillers.
That indeed is an issue I've seen The East Pacific's Magisterium (legislature) talk about. The point of the treaty is to be as loose as possible to escape problems akin to regional sovereignty. The idea was that if a region does not contribute it can just leave/get ejected. However, I do agree some clauses could use more coercion (ie having an embassy and relations with each member region, otherwise there is no point for you to be there) when it comes to being enforced.
Unelected has been answered above. And yeah I understand the idea, though it also again allows you to just opt-out if you do not like one of the changes. However, maybe changing from a ¾ majority to a unanimous vote could help solve this issue? If one region does not agree (in our case if Thaecia refuses one amendment), the amendment is null.
In any case, this treaty prefers believing in the good faith of the member regions than to force them into something. Now the question would be if the regions themselves would agree or not in such belief.