Here's some tips from a Louisiana rider/offshore worker
Latex gloves underneath your normal gauntlet perf gloves will work till 40 degrees the latex acts as a wind blocker
Fogging: keep visor up while stopped close when going to take off, it fogs because of your breath, as soon as your going it'll Defog. Don't waste $$$ on spray
Any "winter" gloves restrict your movement way too much IMO I ride all year round with my perf gauntlets on.
Heated grips work wonders too. Pin lock if fogging is that big of an issue or get a helmet that has a crack visor option like a BELL.
You will be cold it's cold weather season but any numbness that comes is less restrictive that a cold weather glove