In rongorongo times the March equinox coincided with the Sun at ε Phoenicis and 5 days later the Sun was at Ankaa (together with κ Phoenicis). I guess 'the door' where the heart and the entrails of Ulu were buried could refer to the 'door' of the current spring equinox, appropriately ruled by the Phoenix fire bird visible late in September up above in the southern hemisphere.

The 'spring of running water', near which the head of Ulu was buried, would then not be the Milky Way but the Eridanus river, lifting the newborn baby year upwards as if by a hydram towards the left foot of Orion:

South of the equator, however, the flow of the river could be regarded as running downwards due to the force of gravity, leaving a little gap to be jumped over from β Eridani (Cursa) to β Orionis (Rigel):

The 'door' in the C text, on the other hand, could be where a glyph 'is missing', where there is a 'gap' at heliacal ε Phoenicis, when Alchita at the beak of Raven was close to the Full Moon:

To make this 'door' more easily detected the creator of the C text may have formed the pair of glyph sequences in parallel (8 days long and stretching to Delta).

March 29 can be read as 3-29 which should make the reader think of heliacal Antares at the 'door' to the southern summer (in day 329 counted from January 1).

The hare paega entrance would also be an obvious parallel, with its doorway in the mornings leading out into the bright sunshine (or in the evenings for swallowing the tired old people):

Acrux is the southernmost star in the Southern Cross, by the Hawaiians named Newe:

... The first line is drawn from Hoku-paa, the fixed or North Star, to the most southerly star of Newe, the Southern Cross. (This hour circle coincides with the meridian on an evening in June, when it would divide the visible sky into halves.) The portion (of the sky) to the right or east of this line (the observer is evidently assumed to be facing north) is called ke ala ula a Kane, the dawning or bright road of Kane, and that to the left or west is called ke alanui maawe ula a Kanaloa, the much-traveled highway of Kanaloa. (Kane and Kanaloa were important gods in the Polynesian pantheon, Kane being associated with light, Kanaloa with darkness.) ...