Ever make any progress with this?
Not sure how much RAM RF24 requires, but tonight I was able to get Aurora working on a 64x64 display by commenting out a lot of memory-hungry features: Aurora on 64x64 display, SmartMatrix 3.0 Beta
You might be able to use the same branch (modified for 32x32 or whatever your display size is): GitHub - pixelmatix/aurora at sm3.0-64x64