Practice on a pillow. Do doubles, singles and paradidles for about an hour a day while you watch TV or listen to music. You may get sore but it will work.
I do something similar but without the pillow...
Using "Timpani Mallets", start with singles, doubles, accented triplets. & then paradiddles and in that specific order... alternate sticking, plus with BD foot locking down the bars..
(You want (at least) twenty straight minutes of the above)..
Then switch to sticks & go again..
Lean towards more of the accents being generated from your weaker hand...
Cheers
John
Note// Timpani mallets are a handy passenger seat accessory.. you may even find a sweet spot on the dashboard..