My current process for offloading photos off the iPhone is to copy them in subsequent batches of '0-9999' from the 'Image Capture' app.

This is because I usually have far more than 10K photos and apple starts renaming the files after 9999 as 00001(1) for the rest. This is pretty undesirable.

Is there a way for me to export unmodified raw/jpeg/live/videos off the iphone to an external drive without a macbook with a large enough ssd, and wanting to use icloud as an intermediate bottleneck?

Does the PhotoSync app permit that? I use it to copy files to my NAS but it has some USB-related options I never explored. I used to use Image Capture but heard of PhotoSync and have never looked back.

I did it on Linux once I extracted them all as-is in the strange storage way that iOS stores them but I dont recall steps to make it mount the drive.