Chaos res won't be possible to obtain on this amulet, because it already has 3 suffixes on it, and I believe chaos resistance is a suffix [don't quote me on that]
So technically all exalt orbs you will use on this amulet will be a prefix
Those would be:
Increased armour %
Increased evasion %
Increased maximum energy shield %
Increased maximum mana %
Increased rarity find %
Increased spell damage
Increased accuracy rating %
+ # to energy shield
+ # to maximum life+ # to maximum mana
+ # to spirit
Not sure if all of those can spawn on a amber amulet, but perhaps?
If you don't REALLY care about the % life and willing to risk that...
2900 exalt - Omen of Sinistral Annulment - annul will only remove prefix mods
1650 exalt - Omen of Whitling - chaos orb will remove the lowest level mofidier (not very sure yet how those ACTUALLY work)
Taking into account you kind of have two empty lines you want something on,,, it is very questionable if those will be worth it.
How about trying to find similar amulets than you already have with 4 lines you like, and 2 garbage lines and try cheaper crafting methods on those?
5 exalt - Omen of Sinistral Exaltion only adds prefix modifiers to a item, and if they fail, you could consider just a cheap chaos / or annulment orb if you have quite a bunch of similar amulets to work on?