Seems like you have most everything very dialed in already. If your food needs to be cooked, I’d carry the extra 11 grams for another mini-Bic, maybe kept in your first aid kit.
I don’t see sunscreen or toilet paper called out, maybe those are elsewhere under consumables.
I like the umbrella, even if it is 8 ounces – I feel 10F cooler under one. Remember that during a break you can deploy it on top of a bush or tree branch for hands-free, 100% shade instead of mottled sunlight through the foliage.
I’m brainstorming here, but if you only have 1-2 long water carries, how about one or two quart zip-locks, supported by your Opsack, for that last liter or two?
if you bring some heavy-duty aluminum foil, or, ideally, some pre-cut Ti foil, to provide a windscreen around the Starlyte and Epigas 800ml, you might save more alcohol weight and be less sensitive to wind.
You asked about battery banks but I’m going to talk about chargers and cables. IMNSHO, an ammeter is VERY helpful for assessing the relative merits of different cables and chargers. I’ve had charger/cable combinations that seemed weird – like my phone barely charged on them. And others that seemed to charge things very quickly. Once I put an in-line USB ammeter on the assembly, it was immediately obvious that in the same situation (same phone in the same state of charge, because I was plugging it into and out of different charger/cable combos), that not all chargers nor cables are created the same. One might be doing 0.92 amps into the same phone that another combo only charged at 0.18 amps. Whatever battery bank and phone you have, you’ll want them to charge quickly at a gas station, grocery, restaurant, or hostel. Use one of these ammeters to assess your chargers and cables in advance. $2.85 each with free (slow) shipping, they’ve been a stocking-stuffer for all my gear-geek friends for a few years now. Don’t bring on the hike, but use it, as one would a digital scale, to rate your gear in advance.
https://www.ebay.com/i/152823394225?chn=ps