Have you tried doing rudiments with hands, then feet, and then combining hands and feet?
Here's some paradiddles to work both hands and feet..
rh,rf,rh,rh,lh,lf,lh,lh
rf,rh,rf,rf,lf,lh,lf,lf
You could do that for awhile, and then try crossing limbs up a bit with the right hand but left foot and the right foot and left hand substituting..
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