You can found also MicroWebSrv for WiPy, LoPy, etc : https://github.com/jczic/MicroWebSrv
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there are a couple of expansion boards already which I think are enough for prototyping and even smaller units
Given the pricing and the fact that the grove connectors while nice to have are not essential whats the value add?
You can also use grove with pycom base boards you just need the grove to pin adapter
The only thing left is a solar trickle charger but these shouldnt be too hard to get
I think i know where you are coming from but just dont think there is an urgent need - maybe there is