original switch - pop in a USB drive
copy startup-config usb0: (may be different, use "show file systems" to what usb is called - differs on diff platforms)
move usb to second switch, on second switch:
copy usb0:startup-config running-config
wr mem
in the device: section of your script try this
device = {
"host": "xxxxxxxx",
"device_type": "cisco_nxos",
"username": "admin",
"password": "xxxxxxxx",
"fast_cli": False, # Notice the item here <--------------------------------...
