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I think that alternative #3 is a good choice. the input voltage range is interesting. I did not understand you warning about that Vout is 3.8V if Vin is above 3V. that is a misunderstanding. what the data sheet is talking about is that it can deliver up to 3A continuous current if Vin is at least 3V when Vout is 3.8V. if you have Vout set at 3.3V you will have 3A available even at much lower input voltage than 3V.
Ok, so digging further there are others voltage regulators which 'could' be of some interest in various contexts:
Clearly those 3 regulators are more expansive than the MCP1725-3302E/SN and they usually don't admit more than 5.5V in input...
If anyone has some experiences to share about this type of problem I'd be quite interested to share.