Change /etc/network/interfaces as an idempotent transaction with /etc/network/new-interfaces as the new settings to try

refresh-network-safely.sh

#!/bin/bash

# This takes about 2 minutes, unless the /etc/network/new-interfaces works, 
# in which case use atq and atrm to stop the "refresh-network-safely-at.txt" 
# commands from happening
d=$(date +%Y%m%d-%H%M)
backup=$d-interfaces
cp /etc/network/interfaces /etc/network/$backup
cp /etc/network/interfaces /etc/network/temp-backup
cp /etc/network/new-interfaces /etc/network/interfaces
service networking restart

at now + 1 minutes -f /home/goose/refresh-network-safely-at.txt

#**
# refresh-network-safely-at.txt contents
#**
#uncomment the following and place into "refresh-network-safely-at.txt
#cp /etc/network/interfaces /etc/network/$(date +%Y%m%d-%H%M)-non-working-interfaces
#cp /etc/network/temp-backup /etc/network/interfaces
#service networking restart