A person that built his own bikes can install a hub motor or mid drive work. Let me ask if Kapusta's friend with the front hub can climb that hill? In general, I've always felt that if a rider can make it up the hill, then most any ebike can do it with help from the pedals, but you would need a powerful one to do it on motor alone. That could be a BBS02.

Two Bafang BBS02's at $425 each. Skip all the accessories that Luna likes to sell if you buy from them but do get the $19 wrench, unless you have the proper bike tool. Two Luna Minis 52V6AH at $299 each. Problem solved, if the Mini's are in stock. The Bafang doesn't have a really good pedal assist, but on throttle only, they are fine. A 10 mile range should be within the capability of the Mini. I have a Mini and BBS02, but I've never used them together.

https://lunacycle.com/batteries/pack...-6ah-3-pounds/
https://lunacycle.com/bafang-bbs02-750w-middrive-kit/

Tradeoff is you lose the left side front derailleur. Bike will pedal freely. If you romp along at 25 mph, you might not get 10 miles.You cann always add a frame battery down the road. And downshift to a climbing gear when you go up a steep hill. If you couldn't spin the gears with your legs, it's just as as hard for the motor. Get thumb throttles. Twist throttles lead to unintended acceleration when walking a bike.

Easy on, easy off with a hub motor?. Not going to happen if you're thinking your current QR system. A Front hub motors kits should have double torque arms and are carefully wrenched down. You'll have to readjust your disk brakes every time you switch wheels. And I think it's best to only tighten those axle nuts sas few times as possible.