If you really want to try the bubble foil wrap as a dew shield, it is sold in Bunnings but shininess is a problem .
A proprietary clip on dew shield is more secure , enables the bahtinov and you could wrap that with dark Clark closed cell foam and tape or blanket if you like.
I think extending the dew shield is a good thing and a dew band at the corrector end and wrapped around the camera coupling works best with that.
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