Wood,
In my opinion trout are easier to overwinter than warm or coolwater fish as long as you have enough dissolved oxygen, and they don't get stressed by too cold of water like cool and warmwater fish. I wouldn't be afraid to run a diffuser in winter to keep some water open and that is probably where your trout will hang out. In fact, I have feed trout through the ice in the area kept open by the diffuser and in my ice shanty. I had a big brook trout come up into my hole and stick his head out fo the water and clack his jaws. He wanted to be fed!
