Wyll can also be good in melee with Pact of the Blade.
You can respec Shadowheart to Knowledge Domain cleric and use her Knowledge of the Ages daily action to gain proficiency in all Dexterity skills if you'd like her to skulk about like a rogue. While you are respecing her, perhaps also add more points to Dex as well, although using either Gloves of Thievery or the Graceful Cloth (cat robe) to gain advantage on all your dex checks can also work.
"He that can smile at death, as we know him. Who can flourish in the midst of diseases that kill off whole peoples. Oh! If such a one was to come from God, and not the Devil, what a force for good might he not be in this old world of ours."
-Bram Stoker, Dracula
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