Your presentation is not clear about how often the resulting "soil" from the dry toilet would be harvested and used. Perhaps, the "soil' product could be promoted as something of economic value for gardeners and farmers. What is the projected lifetime of a dry toilet?
The core of this idea, using solar energy for desalination of seawater on a village scale, is one dear to my heart. We run a solar-based salt making facility and potable water production has always been part of our next stage of development. I would encourage you to think more deeply about how to make yours a financially sustainable venture because your idea, when implemented well, has a lot of promise for impactful change.
This is directly from the All Power Labs' website: "When fueled by sustainably-sourced biomass, power generation with a Power Pallet is a carbon-neutral process. However, the Power Pallet can also stabilize a portion of the biomass carbon, which would have been released in natural decomposition, into a carbon-rich waste byproduct – biochar. When mixed with soil, the carbon in the biochar can be sequestered from the atmosphere for centuries or more, making the Power Pallet one of the only carbon-negative technologies currently ready for global deployment." On the matter of more inclusion for the beneficiaries in the value chain, we plan to source all of the purpose-grown fuel from local out-growers very close to the points of use. Doing so will enhance shared value by providing a source of income for local residents and enable them to purchase excess electricity for their your uses, among other needs.