Using finales 0,1,2,3
These can all be covered with 8 splits
Wait for one to show and then bet for a repeat.
If won then retrack
If lost then retrack
Progression is for 16 numbers
+1/-1 should be good choice
12 trigger, now bet all finales 0,1,2,3
14 lost, retrack
Done a few hundred spins, nearly all wins come in within 6 losses
Most by 3
You could try worse...