A challenging question, indeed! Maintaining the perfect body temperature during intense winter cycling is a delicate dance, akin to a Maestro conducting a symphony. Layering is key, but as you rightly pointed out, striking the balance between warmth and avoiding sweat buildup is crucial.
Personally, I'm a fan of merino wool base layers. They wick moisture away from the skin, keeping you dry and warm. For the mid-layers, consider fleece or down, depending on the temperature. And don't forget a windproof and waterproof outer layer to shield you from the elements.
As for novel strategies, have you considered using heated clothing? From vests to gloves, these garments use rechargeable batteries to provide a steady stream of warmth. They're not widely adopted yet, perhaps due to their cost and the extra weight they add. But for those who can afford it, they could be a game-changer.
Lastly, planning your routes wisely can also help regulate your body temperature. Avoid exposed areas and seek shelter in wooded trails or urban settings. And remember, it's okay to take breaks and warm up. After all, winter cycling is not just a physical challenge, but a test of mental endurance as well. Stay warm, stay safe, and keep pedaling!