I think this is a problem for a lot of people in various climates. I'm from central Canada where we experience -50c Januaries and 6 months of snow. Step 1 was moving the fuck out of there, which helped. I've been back, but knowing It's optional is massive.

The problem I've faced for 4 years is the rain on the west coast, and the way I manage that is shifting to a different social mode, combining that with intense exercise, and having something that I find compelling intellectually to do. I'm normally a skateboarder, which is impeded by the rain, but I can still find larking garages or indoor places to do that. Partying with friends is great. Wet hiking is fun. If you're not enjoying your life normally, winter hits hard, so work on making your joy more robust. I'd recommend not bothering with any of the hacks on your list aside from lifestyle changes, because they'll probably prolong your ability to omprove your baseline joy quality.