This is slightly unrelated to OSM, but I’m throwing it out there in case it interests anyone to do this.
I had considered rewriting the script, and while I’m at it, publish the processed data both to OSM and transportr via the same script. This project never left the planning phase. I didn’t even investigate how transportr consumes data. I don’t know if some pre-processing is needed or if it can consume the MOT GTFS data as-is. But essentially one needs to create an “IsraelProvider” in the public-transport-enabler library.