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Sadly once you enter the 7 Star Ruins ALL equipment you can make IMHO is 100% worthless weapons wise since the strongest weapons are found by completing all 30 floors.
Btw those frog items are still buyable as in you can still leave the final dungeon enter the "safe house" and buy items then.
Armor Wise as long as the magical rasp is bought Oricalcum = Reflective Plate Armors/Dream Crowns, Meteorite = Sylvan Mail/Boots/Helms, Rune Metal = Robe of Deception make only 1 since I NEVER needed more then 1 spellcaster in the same party.
Sadly the ONLY Star Guard (accessories) required to win Rank A arena battles with specific party members the easiest being iLia, Mavelle and Pericci.