No need for a boost converter followed by a buck converter. Do the reverse. Then the inductor can be shared.
And on the link I posted previously, there's a new idea:
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For the EV charger, maybe some surplus microwave oven transformers can be used as inductors. The switching frequency would need to be reduced, perhaps to the point where cheap standard recovery rectifiers and SCRs can be used. The main disadvantage would be the weight. However, a charger with a power circuit consisting of one large SCR, one large rectifier, and a few microwave oven transformers acting as inductors would be very easy for the DIYer to build.
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I remember reading that SCRs are less sensitive to overload than other types of semiconductors. A SCR can block reverse voltage so no need for a separate input rectifier as the SCR is the rectifier. The low operating frequency means the flyback diode can be a cheap standard recovery rectifier instead of a more expensive high speed rectifier. SCRs tend to be very cheap for the power rating. And old microwave oven transformers can be obtained for free with sufficient salvaging work. It won't be the most efficient charger but it would be cheap and easy to build.