Take Fighter for 1st level to get the Weapon Proficiencies and Armor Proficiencies as well as access to the Martial Epic Boons.
Take Rogue for 2nd level to get Thieves' Can't as well as access to the Expert Epic Boons.
Take Druid for 3rd level to get Druidic as well as access to the Priest Epic Boons.
Take Wizard for the last 17 levels to be able to choose Wish as the initial 9th level Arcane spell in addition to being able to create any spell at all as well as access to the Mage Epic Boons.
Take Fighter for 1st level to get the Weapon Proficiencies and Armor Proficiencies as well as access to the Martial Epic Boons.
Take Rogue for 2nd level to get Thieves' Can't as well as access to the Expert Epic Boons.
Take Druid for 3rd level to get Druidic as well as access to the Priest Epic Boons.
Take Wizard for the last 17 levels to be able to choose Wish as the initial 9th level Arcane spell in addition to being able to create any spell at all as well as access to the Mage Epic Boons.
Unless your game is going to continue well pass level 20 none of those epic boons will matter. You won’t get one at 20 since you are a multi class. You are also pretty mad. Dex, Wis, Int and everyone needs Con.
Level 1 Warlock - Pact of the Blade (Wis) + Hex + Shield + Find Familiar
All the rest Cleric - 1st order being Heavy armour
When you want to : Play like a Paladin by taking Find Steed at level 4, and combining Smite spells with Hex on your Wis-based attack rolls, When you don't play like a full caster using your high level spells.
You have monstrous AC, all the utility of a familiar, all the support of a cleric and more nova DPR than either a pure paladin or pure warlock
Take Fighter for 1st level to get the Weapon Proficiencies and Armor Proficiencies as well as access to the Martial Epic Boons.
Take Rogue for 2nd level to get Thieves' Can't as well as access to the Expert Epic Boons.
Take Druid for 3rd level to get Druidic as well as access to the Priest Epic Boons.
Take Wizard for the last 17 levels to be able to choose Wish as the initial 9th level Arcane spell in addition to being able to create any spell at all as well as access to the Mage Epic Boons.
Unless your game is going to continue well pass level 20 none of those epic boons will matter. You won’t get one at 20 since you are a multi class. You are also pretty mad. Dex, Wis, Int and everyone needs Con.
Counter proposal:
Level 1 Warlock - Pact of the Blade (Wis) + Hex + Shield + Find Familiar
All the rest Cleric - 1st order being Heavy armour
When you want to : Play like a Paladin by taking Find Steed at level 4, and combining Smite spells with Hex on your Wis-based attack rolls, When you don't play like a full caster using your high level spells.
You have monstrous AC, all the utility of a familiar, all the support of a cleric and more nova DPR than either a pure paladin or pure warlock