I've been using a 12V "Doggie Blanket" on and of for years.
Just throw it over the mount (in your case) or in an an observatory over the scope and mount to reduce dewing at the end of the session etc.
(can't see the 12V version...but looks similar)
https://www.ebay.com.au/p/2165053985
(this is like mine:
https://www.amazon.com.au/Roadpro-12.../dp/B0009Y2CFS)