I'm really struggling to follow what you're trying to do - but why do you not just use the same writable store in both your page and template/component? Also,

I'm really struggling to follow what you're trying to do - but why do you not just use the same writable store in both your page and template/component? Also, maybe look into store subscriptions and/or reactive declarations for what you're trying to do. Regardless, it sounds like you really need to just read the docs or do a tutorial.