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Do you mean you want an alternative to Deadlifts for the spinal erectors ?
You could do Good Mornings seated or standing or Kettlebell Swings or Goat Bag Swings . Be aware though that the lower back can take up to five days to recover from direct work so be carefull of doing too many exercises and frequency . Also be sure you can correctly perform a hip hinge , the vid below should answer your question about back alignment I think .
Cheers Kyle
But isn't there also a 'vertebrae by vertebrae' deadlifts derivative?
I'm doing SLD with a firm core at the moment, but thinking I could do with adding something more delicate just for the erectors.