Put down a layer of cardboard, and then cover that with wood chips. I've been chipping away at my lawn this way (get it? chipping away?) for about 3 years and am almost done. As an added bonus it improves the soil as well.
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Does anyone know of better solutions for someone who can chip away for a couple of hours a week at most reliably? Where it wont end up in using all that time policing the edges of whatever you’ve cleared with spades and tears.
No.
You've explained away every option so I think you're back at Square 1. Tough grass to remove and persistent for a long while into shade.
My style of gardening is reforestation so my plan would be fast-growing natives that could get over the top of the grass and start suppression. Then I'd work in shrubs and other native grasses as the Kikuyu weakened. I'd start them in strips or patches and chip/hoe away at edges if I had to.
There's probably no recourse but expense or tears.
Sadness. I was really hoping there would be a tool or method I hadn't heard of.
Guess I'll have to front the 2k to rent a powerful cutter for a few days.