Get all product tags without fetching all products

[oviolion]

As the title suggests, I'm looking for a solution to fetch all the product tags that a store has.

There's this solution that does *NOT* work for my current problem I've got a store with 3,000 tags and as the maximum tags I can fetch is 250 and there's no pagination or "after" parameter

{
  shop{
    productTags(first: 250){
      edges{
        node
      }
    }
  }
}

The `/admin/products/tags.json` API easily returns what I need in the browser, and just as _nicely_ returns an "Error: Not found" when querying in the backend.

The only solution I've got is to query ALL the products (>5,000) in order to fetch all the product tags.
Let's say I'd go with this, except it takes over 3 minutes and results in an API timeout, which is rather not very convenient. 

Is there anything else I could try?