Oooo...good idea, I use Ecowitt integration w/the Ambient temp/humidity sensors and didn't even think of that!
I wonder if the Ecowitt WH51 Soil Moisture sensor would work? I have two in the flower beds and they work great with the Ecowitt GW1000 integration. They go directly into the soil (compost) and measure the actual soil moisture.
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I have them too but their probes are pretty short... they do seem to work great though!
Cheap stage #1 "proof of concept & value of effort" ;
perhaps before rigging up the optimal solution.
That's always been my concern about them for anything but relatively shallow garden boxes. However, if I was going to use one in a composter I would just dump it into the compost and let it tumble around/integrate in w/the mess.
Just don't accidentally include it when your putting compost on your garden. 
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