I know probably this can be done in AE, but is there a way to do a radial gradient blur, where most of the frame is sharp but it gets more blurred as it reaches the edges? I'm trying to do that combined with a dark radial gradient, which I did in the titler, so my goal is to make the frame look darker and more blurred as it goes towards the edges.
PP no longer has that effect. You'll need to use AE.
Use the Compound Blur, and create a map (a radial gradient / ramp, in your example) for it to reference, and place it on another video layer.