Perhaps this quick one is something like you wanted… 
Be aware that I’ve never used Layout, and this is the very first time involving the Layout Ruby API into my code!
Other Notes :
- You have to install and use this Extension in SketchUp (I don’t even think there is possibility in Layout)
- No warranties! Use your own risk! Save your work before use it! Etc. … etc….
- Not fully polished, not tested enough.
- SU2020.1 or newer required.
- Not tested on MAC. (I don’t have it.)
- My mother never talked to me in English.
Dezmo_Print_Layout_to_imgs_test.rbz (33.1 KB)
Usage:
The renaming schema e.g:
Layout file name: mylayout.layout
The page names there: Scene 1, Scene 2, Scene 3, Scene 4
The extension will generate this files, in a same directory where the layout file located:
mylayout-Scene 1_1.png
mylayout-Scene 2_2.png
mylayout-Scene 3_3.png
mylayout-Scene 4_4.png
or
mylayout-Scene 1_1.jpg
mylayout-Scene 2_2.jpg
mylayout-Scene 3_3.jpg
mylayout-Scene 4_4.jpg
(So the “system” is still attaching the page number at the end of the file name.)