Each month shall have 30 days, except within a lune spanning 157°15′57″ (5.242199 × 30°) of longitude, wherein the month shall be extended by one day which shall not affect the cycle of the week. The lune so affected shall shift westward(?) each month by its own width. The phase of the lune shall be such that, in every longitude, the northward equinox shall fall on the last day of March. (During a transition of roughly two years, each month shall have 30 days without leaps, to shift the equinox from March 21 to March 30/31.)
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Alternative idea for calendar reform: Move the orbits of the earth and the moon such that the year is 12 30-day months.
While you’re up, make the moon’s orbit eccentric so that at perigee it sits (approximately) still in Earth’s sky; this helps to lock both bodies in 1:30 resonance.