In 3.5 play, WotC published a bunch of game-mechanic rules for portals and portal magic. You could find them in Manual of the Planes, Planar Handbook, some of the F.R. sourcebooks and even spell reprints/cleanups in the Spell Compendium.

Now that my group is fully transitioning into a homebrew hybrid Pathfinder-&-3.5 system (3.P?) and kicking it off with Golarion as our new campaign world, we'd like to bring over a lot of the those portals mechanics to our new system and campaign world.

Golarion's Elf Gates are probably the closest corollary to 3.5's portals.

Do any of you know if Paizo (or reputable Pathfinder 3PP company) has published any good rule systems, magic spells/items or cultural info on these Elf Gates? And if so, where would we find them?

Also, we loved using 3.5 spells like Scramble Portal, Analyze Portal, Seal Portal, etc. Will we still be able to use these spells as is ... or will they require some mechanical or flavor tweaking to make them usable for Golarion's Elf Gates?