For the first part you can use SNR (single number reach). Configure SNR for the first number in the hunt group. Enable mobile connect, so that calls are forwarded immediately to the PSTN destination...
You will need to test this to know how CUCM will behave when the trunk is down. I am not sure what will happen. What you need to bear in mind is that this will be two seperate calls, hence the hunt algorithm may or may not be affected. Test it and see
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
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