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It’s just my 2 cents but for where you live and what you are riding, get the Bell Mag-9.
This ^^^^
The best helmet is the one you're going to actually wear. For your stated goals, the MAG-9 is most likely going to suit your needs best.
Yes, there are quieter helmets than the Bell you have. All helmets with good air flow and visors are going to be noisier than helmets w/o visors and less wide open air flow into the helmet. There is really no point in you spending $$$ on a helmet if you're not going to wear it correctly. Telling us you fully intend to wear a safety device with the visor open, (i.e. incorrectly), just says you're not willing to go there. So don't bother with the full face helmets.
Maybe try some different sunglasses, paying attention to the temple pieces? Just a thought. Longer temple pieces hit the back of the helmet. Smooth, straiter ear pieces go into the helmet easier. Take the helmet with you to try on potential new sunglasses. And sure, some helmets are simply better designed for eyeglass wearers. Mine has grooves for the temple pieces.
Earplugs. You're not a fan. "Huh?" Get used to saying that "huh?", because as you lose your hearing, you'll be saying it a lot more.
Hearing loss is permanent and cumulative. That means every little loss builds on the previous loss and it all just goes down hill from there and you
never get it back. The white noise of airflow while riding is similar to industrial hearing loss situations. You will lose the ability to hear the higher frequencies first, and then start missing bits of conversation and having difficulty in crowded rooms, etc.
Go to an industrial supply store, (or online where you can often buy sample packs), and buy a selection of ear plugs. There are dozens of different styles. They sell them individually as well as in boxes of larger quantities. Buy a single pack of several styles and try them to find what works best for you. Then, WEAR THEM.
Again,
the best helmet for you is the one you will wear. Just like cameras, the one you actually have with you is the best. It doesn't matter if that awesome digital SLR is sitting on the shelf back home if the shot you want is there and all you have is the point and shoot. Equally, if you crash, it really doesn't matter if you have a $1000 helmet sitting in the garage because it was too hot or uncomfortable. The helmet you have on will be what counts.