2 more thoughts to add to the pile.
1st, there are production bikes available that haven't been brought up yet, that use Bafang's BBSHD and BBS02. This is a mid drive setup, with throttle, but without torque sensing (which helps control costs). Either would offer plenty of power in the hills, and both are well proven designs. The BBSHD actually offers the same power as the Bafang Ultra. There's quite a few available like this, but one of my favorites is by Rize. They make both hub and mid drive (check them out!), but the one I'm thinking of for you is this one:
Explore the City MD eBike, featuring a 750w Bafang motor for easy hill climbs and a step-through design for convenience. With an optional Dual Battery, double your range for longer rides. Perfect for urban explorers seeking power and ease. Shop now!
rizebikes.com
OK, and 2nd, there's a mind set that has a tendency to buy the "last bike first". Like trying to find a "forever" home for your first. This will have a tendency to leave you searching specs. for months (years?). I would encourage you to try and avoid this, and find something that will "work" for you sooner than later. This bike is going to teach you a TON, but the bigger deal is it will let you get out and have some fun while taking off the pressure to find that perfect bike - even if it's not perfect. Buy it with the idea it's going to be passed on to another family member, sold, or just kept as a spare bike.
Good Hunting!!