Its doable. Worth noting that you don't get to swap out invocations etc when you take the cleric level, but only when you take another warlock level after you take the level in cleric.
Its certainly not going to break anything or be overpowered: Eldritch Blast doesn't gain that much from critting since the main benefit of it over other cantrips is adding the ability score, which isn't affected by critting.
Yes of course, same goes for swapping spells. The general idea is taking just one level cleric and the rest warlock.
I am just wondering whether I am better off with taking + 2 CHA (leaving out elven accuracy) and one level fighter (defense fighting style) instead since this means another +1 on AC.
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