I made a kind of solution that does this here:
http://kitchingroup.cheme.cmu.edu/blog/2015/10/09/Automatic-latex-image-toggling-when-cursor-is-on-a-fragment/
You might see if it does what you want.
Knud Soerensen writes:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Hi
>
> I love org-mode and use it a lot for latex notes.
>
> I will like to suggest a new latex setting which let org-mode show the
> latex code when cursor is on the code line.
> But when the cursor leaves the code line the latex is automatic rendered
> to a image.
>
> This will save many C-c C-x C-l and C-c C-c and make Latex editing much
> easier.
>
> If the latex is a multi line block it should only render when you leave
> the block.
>
> Thanks for Org-mode.
>
> Knud
>
> -BEGIN PGP SIGNATURE-
> Version: GnuPG v1
>
> iQEcBAEBAgAGBQJWFRvTAAoJEIiA+jisx2wbROYH/3dCDHgxsZqbGydxOUkpzA6I
> Ls0p92xYOD3be15EXozCftMUMmqbeWB3mMDipwu3ZNJKhRKz/P+m7gHW+quVitkg
> 4C7O27r0ka7/oDELV7TCkfMFCZ1MSKELqHA/qDegkz3tS14/h542QxGiJo6utTs1
> LMajLUNYOm/TbVtvM1otI4f+EqapTeZYyFhvh64KyKZRUvHteUk5wRtZMiTDglKF
> WhM9ObOS8R6RkMDNb/yWPiuydGnjsCgOoO5B7qr4DxqK5l8+IePcRZBeZpaM767U
> lEf0gRMbA030q+UXhAbbKN0Kn8s0K+SDt0yAer1/NE9PDGeObIWiOwHXz3nA61E=
> =PPw+
> -END PGP SIGNATURE-
--
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu
