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There is one other way of keeping eyepieces warm in the EP box (whatever you carry them in): thermos of hot water and a hot water bottle.
A little hot water in the bottle, capped nice and tight!!! and placed in the EP box. Might need changing the water every couple of hours or so, but it really works to keep the EPs warm.
I do use a dew zapping system for my big dob. It does complicate things, but when everyone is out of business due to dew, I'm still going. There was frost on my truss poles the last time. Optics - just fine!
Just something you need to decide for yourself.
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