[Matrixbeast]

I think Kuuga could work. The mythos behind the Grongi is pretty violent as is.
Make Daguva a proper villain with more set up than 2 silhouettes appearing in a blurry photo, give Gadoru-Ba more screen time and more set up as a counter to Kuuga's Rising forms to force him into Amazing (Or hell, cut Amazing and have him go Ultimate to beat Gadoru, but still only match Daguva), make the Grongi's goals as a whole more clear, and focus more on Ichijou as a character.
They could even do that SIC follow up with the one chick becoming a second Kuuga.

Granted, my wants are more as a Kuuga re-write rather than the Amazons treatment.