The plan will work briefly but will be abandoned in time when bad actors will ruin them through abuse as well as public sexual interludes.
This is the real reason why public facilities do not work. People are pigs and or do nasty things in them.
I doubt you could even provide a water hose for people to wash up with.
Even public areas like parks ..while most are serviced are kind of gross...i mean if you knew what goes on.
And tent cities and hobo encampments are grody to the max.
No, no, not until the ones who proposed this have skimmed it to the bottom. That is the result (& purpose) of every similar plan out here in CaCaLand.