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I'm putting together a product for this exact use case, here is how I have approached it so far, I put together a custom cli that handles your first and second points using taskfile.dev as the engine + terraform, for the last one you can use something like kubefirst.com + terraform

I think this came up before and you may really like this thread. The tl;Dr is that it is hard to change user behaviour, so thinnest viable platform may be very small now (and don't get enticed to make it bigger than you need!). But getting the interaction model between users and your offerings right may help introduce new offerings a bit easier as and when you need to.