The Remarkable and the Supernote seem to fill that role.

I started obsessively looking at them earlier this week, and my conclusion is that they're not ready for prime time yet. The Remarkable software team is facing heavy criticism. The Supernote team is lauded for their responsiveness, but they don't have warehouses in Europe. Both companies accept preorders, not actual orders.

The ideas and hardware are there, but the products still need a lot of refinement.