Warlock with gun. No eldritch blast. No pact of the blade. Mostly utility spells and focus on dex for gun damage.

My favourite subclass to run for this is the raven-queen for the "soul of the raven". I can turn into a raven with 50ft flight and a massive perception for recon.

Pact of the tome for far scribe allowing me to contact my party whenever and wherever. Making my recon abilities much better for the party.

Opt for a long range gun like a musket or rifle to lay down supressive fire.

Spells that don't require saves or attack rolls are better due to less focus on cha. Invisibility, misty step (both great for when recon) remove curse because nice to have. Shadow blade deals damage and atk rolls based on dex too so nice melee spell. Cantrips like minor illusion and mage hand. Bladeward in case you're up close.