G'day Dave, welcome to the forum.
Re radio, there have been a couple of topics covering radio reception and weather forecasts,
here and
here.
There might be something in those topics that could help.
Best forecasts you can get on the South Coast track is with a satellite phone and ring the weather bureau forecasters direct, 62212000. Or better still, have the phone and turn it on ad designated times of the day, with a home based support crew to ring you with detailed forecast info at a designated time. Unfortunately either option with the sat phone means extra weight, and likely significant cost, neither of which would help with the sanity aspect.
After 4 years break, I would strogly recommend at least a few day walks to test the fitness and get the body used to the boots and pack again before doing the SC track, but you probably know all that if you've done walks before?
In light of the discussion about New River Lagoon, I don't want to see every new topic like this one turn into a flood of caution warnings, but a solo SC track attempt after a 4 year break from walking does make me
want to ask a few things (not least of which is
how experienced is "semi-experienced").
I hope the radio links help you.
Re SC track, which way are you planning on going? How long are you allowing? Feel free to ask questions here if you feel inclined to want to know more, lots of people on this forum with good advice and info. Crossing South Cape Range is a dog of a day. IMO harder than the Ironbounds.
Cheers!
Adam.