Have you looked at Frostbite? It's Vicious Mockery for someone wanting more damage than utility.
Produce Flame is another option if you don't have darkvision.
Hunting Trap isn't work it because you need something to attach them to otherwise its just 1d4 damage. Manacles sound better but the book doesn't actually say what happens when you apply them, just a 20 DC to get free.
What they said. Only use for shillelagh is when using casting stat also for melee. Great on a full caster but pointless for a fighter. Also means no Haste.
It's only 2x on the cleric build. Quicken lets it be a bonus action but your still limited to a cantrip for your action cast. So its high level bonus action cast, cantrip, and then surge for another high level cast.
Problem is theorycrafting with AL gear. Not everyone has all the campaign books or wants to spoil the campaign for loot they might not get. Aim for no gear charop and not this stealth bragging you've got going and people will take the challenge.