Atomic Perception

Try placing your custom format python export code inside the Post-Write event of a ROP Output Driver or File Cache node. Then you can use the Save buttons to write out your geometry.

You can check out an example of this technique here:
https://forums.odforce.net/topic/25260-clarisse-work-flow/?do=findComment&comment=147996 [forums.odforce.net]

Check out the FLIP Multi-phase example file in the content library.
https://www.sidefx.com/contentlibrary/flip-multiple-phases/ [www.sidefx.com]

Yes, just paste a complete file path to the font into the text field. If you hover over the Font label, you'll see a tooltip that reports the parameter's name as file.