You have posted a great practical assessment video. Ears don't need instrumentation to assess the effect, and a lot of folks will hope for something that can add on incrementally, as you tested and as manufactures supply now. I bet in the future, the DSP will be more resident on onboard software of the AVR, and less reliant on hardware in most speakers. As you pointed out from the patent, they have both options. Speaker angle, too, may depend on room size and listening position, unless the DSP software and spatial characteristics of sound perception, as claimed, render such precision unnecessary for reflective overhead speakers.
Also as you mentioned, focus of in-ceiling or high wall mount speakers to the listening zone in a tall room seems a good alternative for some. I have a 22ft cathedral vaulted ceiling over 24'x42' with a tray shelf at about 10 ft high, so, short of suspending an architecturally unappealing 8x8' acoustically non-reflective grid or a platform for mounting speakers and projector, dropping it from the roof or supporting cable between the tray shelves, your suggestion to try direct projection sounds like the best option.
I will be interested to hear how others resolve this issue.
I should think there may be a market for a stand-alone customizable 3D soundfield processor with output to the customers' existing dual amps or dual AVRs for those already invested but DIY-inclined and on a limited budget, to get power to 5.4.1, and up to 7.4.2, 7.6.2, 9.6.2 et c.