In all honesty, is better to just make a "portal hub" but directly in your "mother base" (basically a base where I place all important materials), I have one portal for each island I've discovered and place a portal mark on the map so I can remember the tag and where it goes.

The materials are by no means hard to earn, so trying to be "efficient" by saving materials on this one is just making you either use kys command or cheat eventually, with a cost in dignity and skill levels.