Thanks for replying and for the info.
Couple ?s.....

You said:
Then generate an OFFLINE SIGNED TRANSACTION using qt.

Are you referring to the Bitcoin QT(my current cold wallet)?

You said:
Copy that signed transaction only
onto an online machine and broadcast it.

Could you elaborate?  Am I broadcasting it using bitcoin qt or electrum or......?
What is the step by step to pull this off?

Again, thanks.  Very much appreciated.