All im doing is buying the Ledger to sweep the BTC from Electrum to the Ledger using an office computer. Have to sign the off-line transaction using a fresh internet connection which will be a hotspot on a new phone & new sim.
What do you mean when you say "sign using an internet connection"? There's no need to go online with the system that holds your private key. This is what I would do:
I was considering Electrum, only downside is that when creating a wallet, seed creation is exposed
Online:Install Electrum on your PC.
Import your address to create a watch-only wallet.
Preview the transaction, Copy the unsigned transaction. Put it on a USB stick.
Offline and running without hard drive storage:Get a Linux LIVE DVD. Use Knoppix or
Tails for instance, or any other distribution that comes with Electrum pre-installed.
Unplug your internet cable. Close the curtains. Reboot your computer and start up from that DVD. Don't enter any wireless connection password. Keep it offline.
Start Electrum. Import your private key.
Copy your unsigned transaction from the USB stick, load it into Electrum.
CHECK the transaction in Electrum. Check the fees, check the amount, check all destination addresses (
character by character).
If all is okay, sign the transaction. Copy it back to your USB stick.
Turn off the computer. That wipes the Live LINUX from memory and all traces are gone.
Online:Use your normal online Electrum to (check again and) broadcast the transaction.
Bonus:After moving all your Bitcoin, and once the transaction confirmed, check if you own
Forkcoins.