I have a 2013 G37s in Slate Blue but have not been able to find accurate touch up paint at local dealer or retailers in years.

Most dealers have gone to water based paints that cannot store long term as touch up paint.

Are any of the touch-up paints like Dr. ColorChip even remotely close?

 

This is the company where I got my touch up paint kit, I did a search for your year and model:
https://touchupdirect.com/touch-up-p.../#pf-year=2013

I only saw Comino Blue Pearl. I'm not sure if that is the same as your car's color. You can try searching for different years or models if they have other blue options.

 

They have Comino Blue Pearl listed for the RAW color code. But RAW is supposed to be Lapis Blue. The Comino Blue Pearl doesn't look like a good match for Lapis or Slate Blue.