> Instead of morse code, use a simpler code where ones are a short beep
>  and a longer beep is a five. Two longs means zero.

No.   Is better to use the correct abbreviated morse characters...

 1 7-
 2 77-
 3 7--
 4 777-
 5 777
 6 -777
 7 --7
 8 -77
 9 -7
 0 -

................ Zim ........... VK3GJZ

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