This fantastic piece from Lee Varis starts with a refrain many of us have heard, Fuji’s JPEGs are great, but then quickly moves into some excellent examples that demonstrate how. It’s a must read or watch (I watched), and it’s nice to see Astia get some love.
My only caution might be on layering a JPEG over a RAF. You’ll want to be mindful of Fuji’s in-camera corrections, depending on which lens you have mounted. Another approach might be to shoot with Film Simulation bracketing and use one of the colour Film Simulations for the layering. Cool effect either way.