Preparing SD card for [hopefully] incoming Pocket.

Hi, August 2022 pre-order here [#149xxx]. As some others have, I have bought accessories for the Pocket during the seemingly standard purgatory period they put you through in having you wait for your order.

I'd like to prepare my microSD card in anticipation of receiving the Pocket soon, hopefully. What are some files I can have prepared to hit the ground running with firmware and various cores when I receive my Pocket?

I have experience with Super NT and Mega SG [thankfully bought years before shortages/final runs] but understand the Pocket's filesystem is different.