I see where this is going, and availability (off the shelf) and 'special order (8-12 weeks) plus high price seems to be the major reasoning for this application question.
I use this solution when a project like what you describe comes in for plan review and release. A email, and/or phone call to the EC or responsible party requiring a signed and sealed letter with info from a NJ Lic. PE/EE that the proposed installation is approved by that PE/EE.
I am not aware of any situations that are related to the dry type transformer 'backfeed' installations. Also, FWIW, to the best of my knowledge, our utility company uses the standard pad mount transformers for direct grid tie solar installs that are utility owned,
