Well then the obvious solution in my mind is to ditch the +s.
+3 shield, +5 wand, +6 sword, +4 armor, +2 amulet, toss them all out the window. Any magic item whose sole function is to give a + to things like attack rolls, or saves, or whatever the new system use, go out the window and magic items from that point on are all about abilities.
Amulets of natural armor, belts of giant strength, and such get ditched in favor of necklace of fireballs and belt of one mighty blow.
+3 shield, +5 wand, +6 sword, +4 armor, +2 amulet, toss them all out the window. Any magic item whose sole function is to give a + to things like attack rolls, or saves, or whatever the new system
Amulets of natural armor, belts of giant strength, and such get ditched in favor of necklace of fireballs and belt of one mighty blow.