For 1.18.x and newer,
A block with or without an interface
if no UI maybe something of an item frame
if with UI a single slot in which to insert the pocket storage

That can be connected to from pipes hoppers and storage busses from all mods
a side config would be handy where the player can set what direction to insert/extract from.
this would be useful with mods like thermal, mekanism, ae2 refined ect.