First of all, the Trans Pacific Partnership is a treaty, not an organization. Second, it's a treaty that the US built. Third, the signatories were: Australia, Brunei, Canada, New Zealand, Japan, US, Malaysia, Mexico, Peru, Singapore and Vietnam. Zero Europeans were involved.
The whole trade agreement’s negotiations were kept secret from the American public until leaked (to me that certainly means secretive). Under the accord, companies and investors would be empowered to challenge regulations, rules, government actions and court rulings — federal, state or local — before tribunals organized under the World Bank or the United Nations. Sounds kind of like an organization or two was involved.
And TPP seems more about the environment then trade (see below). So, I don’t really like your solution.
The Parties recognize the importance of mutually supportive trade and environmental policies and practices to improve environmental protection in the furtherance of sustainable development.
The Parties recognize the sovereign right of each Party to establish its own levels of domestic environmental protection and its own environmental priorities, and to establish, adopt or modify its environmental laws and policies accordingly.
Each Party shall strive to ensure that its environmental laws and policies provide for, and encourage, high levels of environmental protection and to continue to improve its respective levels of environmental protection.
No Party shall fail to effectively enforce its environmental laws through a sustained or recurring course of action or inaction in a manner affecting trade or investment between the Parties, after the date of entry into force of this Agreement for that Party.