292 can be also be interpreted as 192 + 100:

All these glyphs, 472 of them, cannot possibly represent the days of a normal year. There are too many of them. Therefore we cannot take for granted that 180 glyphs from takaure to the end of side b really should be counted as days.

100 + 180 = 280 = 10 * 28 is maybe only a number to indicate the kind of season beyond glyph number 192, i.e. the time when the proliferating Spring Sun no longer is present. Moon is still shining from the rays of Sun, though, which can motivate 28.

10 is the number of 'months' when Sun is present. When he is absent, away in the far north visiting his winter maid, it should also take 10 'months', because the region north of the equator is a mirror image of the region south of the equator. The cycle of Sun should be 2 * 10 = 20 'months' long, and 20 * 18 = 360.

180 (= 10 * 18) glyphs to the end of side b could therefore maybe correspond to 180 glyphs at the beginning of side a. The end of side b could illustrate the days when Sun is on the other side of the equator and the beginning of side a correspond to the days when Sun is 'present' on Easter Island:

It is probably significant that tamaiti (a Moon child with neither arms nor wings) at Ga7-11 is the first glyph beyond the 31st and last of the periods with henua-kiore-maro (when Sun stands on earth and creates growth):

If this idea of a 'mirror' so to say placed at puo in Gb8-30 should be correct, then it would be of value for interpreting the whole text of G, and we must therefore take a closer look.