Was trying to research this myself today.
From what I learned they nerfed WWsins a bit here. Previously you could equip 1 slow and 1 fast claw, such as a rare fools War Fist with a Chaos Runic/Greater Talon and still hit the 4fpa easily.
Now a Suwayyah (base 0) claw needs 83 extra IAS to hit 4fpa WW, and a War Fist (base 10) needs 117! Basically unachievable.
Greater/Runic Talons (base -30) only need 23ias, so any Chaos (+35ias) made in them will hit the 4fpa , and any 2nd claw in a similar base will need at least 25ias.
From this, I dont see any way to use any claw other than GT/RT without hurting the rest of your gear to find extra IAS, but let me know if anyone thinks differently. It's a shame because I loved looking for high damage War Fists/Suwayyahs, etc, but now they seem useless.
Here is a calculator you can play around with:
https://warren1001.github.io/IAS_Calculator/