I suspect I would ride more like you. That’s what I meant by 250W of human assistance. I’m not after breaking any speed records, just want to bring down the estimated 2800 calories I used on my last commute to something more sustainable/repeatable day after day. And I would likely use a normal bike some days too.
I just wondered if a hub motor would work well and still contribute at the low speeds of the steepest gradients I have to do. Without emptying the battery too as I think the range of those is close to my total journey. On the flat, which is 60% of the journey, I would be doing all the work as I tend to go ~30kph, that’s one reason I want something close to a non-powered road bike, so I suspect the battery would last ok.