Cleric / Paladin Multiclass?

Before I start, I know this won't be an optimal build, just a bit of RP fun for something I don't want to take too seriously, just want people's thoughts on how this will run.

Im about to start a BG3 run on co-op with my friend and have come up with an idea of running a dragonborn Tiamat / Bahamut (depends on whether we go good or evil run i think we'll just decide on character creation) Red/Silver Dragonborn Vengeance Paladin (if i can keep my Oath, if broken no takesies backsies) / Light Cleric combo with a dip in Hexblade so I can dump strength with bind weapon

8 STR 14 Dex 14 Con 8 Int 14 Wis 16 Cha

Level 1 - Hexblade (Booming blade and minor illusion cantrips) Level 2-6 - Paladin - Feat ASI Cha Level 7-12 Cleric - Feat either War Caster or Savage Attacker

Foregoing aura of protection for an extra chanel divinity (Radiance of the Dawn) and an additional level 4 spell slot

Helmet of Smiting / Holy Lance Helm Luminous Armour Gloves of Beligerant Skies Boots of Stormy Clamour Cloak of Protection Coruscation Ring Callous Glow Ring Any Shield (likely Adamantine to prevent crits) Weapon will be Blood of Lathander (Act 1) Charge Bound Warhammer (Act 2) and The Sacred Star (Act 3)

The idea is to be a a spirit guardian, radiant orb, reverb spamming god with smite/spirit guardians causing radiant orbs, Booming Blade to build reverb, and eventually have a weapon that will deal radiant damage on hit without need of smite and someone who basically turns into a Dragonborn blender once we've max levelled..

This is only a theory right now, how do you guys think this will work in practice? Always open for people to suggest a better way to build this!