Randy and all - note this is my first (and maybe last!) post in this ongoing Randy vs everyone else saga - one that bridges not just topics, but whole websites!
Randy - I too have tried the geared route - using a lightweight multiKW motor geared down before the final chain drive. It was superb - seriously. I could (start) climb 45 degree slopes with ease in 1st gear - and do 30+mph on the flats - all at greater than 80% efficiency. All made possible - as you say - by gearing
My motor was turning 10KRPM using a single stage worm reduction and then driving the front small chainring directly. Not as flexible as your solution of course - but then I was aiming to offer it as a kit for retro-fit to existing bicycles and it was quite clear (to me at least) that running 2 chains to the rear wheel was just not going to sell
I don't think anyone here actually believes its more efficient to pull 30% of max revs at full throttle up a steep incline than 100% - that is not something people are making a fuss about!
TBH I think you have pretty much the same problem as I had - mounting the motor/gbx reliably - to the various frame designs around. It's something I couldn't overcome reliably and the reason you can't buy it now!
Bottom line is - as good as a geared setup may be - the added complexity is not needed for the vast majority of people - since most people really do not live near the top of a very steep mountain range - like you!
BTW Randy and all - please take the time to do the 100ft test - it is a good (simple) benchmark and I'm eager to see just how yours, the Puma and Lowell's X5 perform
It took me less than 3 mins to pop the battery on and do the run - go do it now!
Scott