Reads to me like OP is mostly interested in gearing up, and if they want to circumvent any timegates, best they can do is farm Aesthetic Tomestones for Rain so the crated i710 crafted gear can be upgraded to i720.
Or one can do the daily hunts. Doing ShB / EW / DT Hunts nests 330 nuts per day (and another 300 per week for the weekly targets), which can be exchanged for upgrade materials. (mind, that is still timegated, but it can help a bit)