It might be a silly idea, but that’s what I do with my weighted blanket when I want it to be a bit heavier: I fold it just over my shoulders, and leave it single on the rest of the body. It doesn’t change the thermal properties much, but it feels better. So you could try a lighter weighted blanket (10 or 12 lbs), folded on the shoulder. The problem is that lighter weighted blankets are probably not necessarily cooler than a heavier one.
Are you trying to be a cliche stereotype of a vegan in a joke?
I’m not vegan, I dong eat meat and I very occasionally eat fish. I follow this community because veganism is something I value without being fully committed to it. The idea of eating something I like without the bitter ethical side-dish (in theory, nothing is perfect) is very interesting to me. And totally worth of the “vegan” label.