Maybe something similar to the BBC funding model. AI sovereignty may become at least as important as public broadcasters going forward.

Groups of smaller countries could build coalitions to fund models (and research), managed by a non-partisan entity and combining taxes and licensing.

Models would likely to have to be open weight to reduce the risks associated with power concentration: businesses/researchers/individuals can self-host for privacy and scrutiny, tax-payers and local businesses access funded infra for free, other use cases require a paid license.