Lumix Rail Pass transfers > Offline Online 1 > Identical subfolders and file names (with source files)
> Offline Online 2 > Identical subfolders and file names (with proxy files)
All I would need to do is swap the number 1 and 2 of the folders when the time comes, yes?
It sounds right, but you may want to test it with two or three files just to make sure.
I have done this with footage using identical codecs and frame sizes, and with still images, but never with proxies.
Just out of curiosity, why are you going to be using proxies? What kind of footage can't your system deal with natively?