How about a bunch of tools to help a warlock hide as a different spell caster?

 

First we got to fix the hex problem…

 

Agony

1st level Enchantment

Level: 1
Casting time: 1 Bonus Action
Range: 90 feet
Components: V, S
Duration: 1 minute

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You cause a creature in range to feel the full furry of your anger.  Once each round, starting on your turn, and refreshing at the start of each of your turns when the target takes damage, add an additional 1d6 psychic damage tot he target.

A remove curse cast on the target ends this spell early.

 

So we can replace hex… now we got to fix eldritch blast…. with a eldritch invocation!

Malformed Arcana

Choose a spell you can cast and a spell you can not cast.  The spell you can cast looks to all observers like the spell you cannot cast.  No other parts of the spell are altered, and casting detect magic will reveal the deception as the spell type will not change.  Intelligence(arcana) checks on your spell will still normally show the spell you can normally not cast.

 

ok we got the bread and butter of a warlock figured out, so now we fit the final pieces together…with a feat!

 

Deceptive Warlock

prerequisite:  warlock

Some warlocks are open about the pack they made, and others hide it as their masters need deception.  You hide in plain site to further your dark purposes.  Gain the following benefits:

• Increase your Charisma by 1, to a maximum of 20.
• Gain two eldritch invocations that must both be malformed arcana.

 

First level Wizard that just happens to be a warlock behind the scenes is a go!