You have it right. Step down transformer to 24v. Wire the thermostat in series with the damper motor. I would try to incorporate a high limit switch in the loop as well.
An issue with the wood boilers is to LOW of a return temp causing the heat exchanger to rust out prematurely. It would be good practice to install either a manual bypass valve or better yet a 4 way mixing valve to keep the return temp within 20F of your supply.
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