Silicone based line conditioner seems to slow down the icing on rod guides for me fishing from my boat on freezing temperature days. I spray my line and spray the guides and repeat on the guides as needed.
best way is to use a one man flip over and small propane heater
Even when hole-hopping, a one man is pretty quick to move with.
In fact I think it’s easier because your dragging your gear with rather than trying to carry rod/flasher/bait from hole to hole
if you’re gonna be outside, next best thing is what Art Green suggested