What do you heat with? Do you have registers where you could put a bowl of water on one in the room where the incubator is? Or maybe a small humidifier in that room?I can't see any reason why it wouldn't work...I got a little reptile one for my incubator. I candled my eggs and the air sacs looked a bit on the small side to me. I'm maintaining temperature, and letting them dry out a bit. I've no idea if it will work.
Next time, for sure, I'm doing dry incubating - it seems to be a bit less fraught. The only issue I have is that our house is quite dry (we used to have moisture problems so we really worked to fix them), so it's lower than the general humidity available elsewhere. Maybe I'll keep a bowl of water near the incubator on the outside.