You cannot add your charisma bonus twice. “Add your charisma bonus” is the same thing repeated, like “die your hair blue”. You have blue hair, not double blue hair.
The general consensus is you can add your Charisma bonus twice, moreover even if you can't add your Charisma bonus twice, but any character with 2 levels of Warlock can certainly add your Charisma bonus and another ability bonus.
This would require boosting two stats but is certainly doable in multiple ways, especially on a Fighter with an extra ASI.
At 14th level (Warlock 2-Fighter 2) with Shilleleagh, nick and Hex, you would still be getting 4 attacks, one of them a truestrike doing 3d12+7d6+25 and adding sap, push and slow on to 3 of those attacks, and that is not even using your origin feat.
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