I don’t think there is a plug-in that bypasses the internal storage. If you’re trying to record a super long video, did you see Laszlo’s streaming plug-in example? If you stream it, maybe you can record a really long video without having to worry about the internal storage filling up. Laszlo is @biviel on this forum. He’s going to put his plug-in into limited testing soon. The video is a 360 video so be sure to spin it.
https://www.flow.tours/en/product/33
You can learn more about this upcoming plug-in by @biviel by signing up for this SXSW online free event.
RICOH THETA Virtual Booth at South by Southwest
The plug-in is covered in the first event at the top of the document.