Most efficient way to create projects for a multi business unit environment

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Hello everyone,

Given a context with multiple legal entities and multiple business units (80+), what would be the most efficient way of creating projects.

Projects must be created via project templates and each template has to be associated to a Business Unit upon creation of said template. Also, there is no opportunity, such as the Quick Entry fields to change the Business Unit (contrary to the Legal Entity which can be changed from the template this way). Therefore, I would need to create 80+ project templates... I've also looked at creating a project template from a project, but that also copies the Business Unit from said project and makes it unchangeable...