Final mock up of the mount. I don't have anything outside of hand tools, but it turned out as expected. Changed the steel clamping plate to aluminum, and modified a front post mount adapter for the rear as the rear adapter would have needed some mods, and it is the only rear adapter I have, and I have 4 of the fronts.
Now onto the lever. I don't want it on the handlebar as there is no room left up there with a bike computer, phone mount, light, and bar end shifters. May look into mounting the lever on the stem, "top cap", or on the seat post, which seems to me the best option.