Configure dedicated domain for a participatory space

We've got many requests that a client would need only a single feature of Decidim for a specific purpose, e.g. proposals or budgeting. Most of the times they don't need the whole participation application, only a single process or a single assembly. We've also got feedback that the navigation structure is overly complicated for some of these cases which may also cause a lot of confusion among the users if the system is only used for the single process and a single feature within it. It would really serve these use cases well if we could configure a dedicated domain for a process or an assembly. This would make the navigation clearer for the users and would serve the "campaign" type use cases better. I would see it functioning as follows: - Front page of the domain shows the process front page - The top navigation shows the process navigation - Everything else would remain the same