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Wow... when you said 'Morse Code', I imagined a tiny on/off switch (push-button) that turns on/off a simple electronic oscillator.
Your project on post #7 is an interesting one. But it needs also that the builder has mechanical skills which I don't have , unless he looks to buy some ready made devices.
---------- Post added at 03:47 ---------- Previous post was at 03:43 ----------
Good... and the good news is that an oscillator made for AM or FM works to send low rate signal as morse code.
But to receive this signal, it is better to work on the AM waveband I guess, by adjusting the oscillator frequency around 1000 KHz (where the reception is quiet, if this is possible among the crowded channels )
Elenco includes a "wireless code transmitter/morse code transmitter" experiment in some of it's larger lab kits (MX-906, MX-907, MX-908, MX-909) that transmits on the broadcast AM band but jealously guards the schematic from publication.
Ramsey Electronics has two AM transmitter kits, the AM1 (varactor tuned) and the AM25 (frequency synthesized) which both have an audio input jack so you could use any code practice oscillator as the input. They make a kit for that too, the CPO3. Like Elenco, they don't publish their schematics.