How to integrate Redis with SQLAlchemy

I'm learning to use SQLAlchemy connected to a SQL database for 12 standard relational tables (e.g. SQLite or PostgreSQL). But then I'd like to use Redis with Python for a couple of tables, particularly for Redis's fast set manipulation. I realise that Redis is NoSQL, but can I integrate this with SQLAlchemy for the benefit of the session and thread handling that SQLAlchemy has?

Is there a Redis SA dialect? I couldn't find it, which probably means that I'm missing some basic point. Is there a better architecture I should look at to use two different types of database?