I'm with you on keeping it simple. A good pair of gloves, warm hat, and warm socks are essentials for me too. I've tried face masks and they're not my thing either. But, I do think hand warmers can be useful on extremely cold days. Just remember to dress in layers and you'll be fine. And don't forget to stay hydrated!
I've also transitioned to minimalist shoes and it's been a great decision for me. My running form has improved, and I've noticed less fatigue in my legs. Like you said, it's essential to ease into it and not try to do too much too soon. It's a process, but the benefits are worth it.