How to start with createRouteData but transition to a Store (while keeping refecth working)?

[IKoshelev]

I'd like to have an app with a single proper Store (so, components are almost stateless), but still use SSR to speed up serving and take care of SEO.

I inversion this working as follows:

When user initially opens the page - for simplicity, createRouteData of each page returns an object with a signature identical to the Store, that object becomes initial state of the Store.
User can interact with the page - like with a normal Store-baed app.
If user triggers refetchRouteData() - a new object received from the server is merged into the Store.
alternatively for the future, a custom merging function is provided for initial store creation / refetching.

According to the docs

createRouteData uses a Solid Store under the hood to store its data. 

Is it possible to somehow tap into that Store, or wire createRouteData into an existing one?