I know some recently-unemployed Kenyans with relevant work experience who could be hired cheaply to assist the overworked teachers.

(BTW, it's "poring" not "pouring".)

That's an interesting idea.

I wonder how easy it is now for Western high school teachers to outsource things like lesson planning or grading tests to lower-cost countries? Startup idea: build a marketplace like that. There has to be a market for it.

For essays certainly would be good, could even be better If multiple people read it and give independent feedback.