Yeah, in the Enochic tradition, Enoch was taken up into heaven to be shown the secrets of the cosmos (the cycles of the sun and moon, the rotations of the stars, the hidden depths of Sheol, etc.), and then he was placed in heaven to be the scribe who writes down in the "books of life" the deeds of every person in every generation until Judgment Day. Then he will return to earth with Elijah just before Judgment Day, when these books are opened and every person who has ever lived is judged on the basis of what they have done in their life. In later tradition, the heavenly Enoch becomes glorified as the angel Metatron, the Son of Man, the Anointed One, or the "lesser YHWH".
I have an old thread which explores the possibility that Enoch (seventh in line from creation) was based on the Sumerian antediluvian king Enmeduranki (also seventh in line before the Flood), who was especially beloved by the sun god Utu, who was known as the Utu who ascended to heaven and received an understanding of its mysteries.
It is therefore noticeable that 365 is the number of days in a solar year. Coincidence? A variation of the solar calendar (a sabbatical calendar with 364 days, which is evenly divisible by 7) is especially prominent in the Enochic tradition (see the Book of Luminaries in 1 Enoch).
I'm not familiar with any "alternative calendar" attempts to shorten the ages of the patriarchs, although there were attempts to connect (some of) the numbers to the Babylonian sexagesimal systeem. The main observation that still stands, however, is that the ages (or lengths of reign) in the Sumerian King List show very much the same pattern .... insanely inflated lengths before the Flood (even more so than in Genesis, on the order of thousands of years), then decreasing ages after the Flood, until they reach the normal length when one reaches "contemporary" times.