I looked at this problem many years ago, when we thought that the Soviets were going to blow us up.
With one watt of CW and morse code, one can get around the world. CW also is hard to jam. But you need to learn Morse code. There used to be Mac compucer programs that would teach you.
What I never found was a good source for CW radios that didn’t require an arm and a leg to buy. I needed about 10 at the time.
Growing up I had a couple of mentors who helped create amateur radio. They could build a radio and trade code at 40 wpm with a box of radio shack parts.
Sat down with one of them and did it. Took a couple of hours.
What is a “CW?”
You no longer need to know Morse code to use Morse code. There are small portable Morse code readers and converters that you just type in your message and it goes out in code. It receives Morse code and displays it as text. There are even more effective means of low power communication. JT65 is one and is in widespread use.