The warlock dip works well for support. Pick up musician, protection style, inspiring leader, telekinetic, and Warcaster (booming blade) for 20 Cha.
No it doesnt, and you're using some 20th level 'build' that is likely never going to see the light of day (most games end in the mid levels at the highest, and often around 5th-6th).
Sir Mono-din
Vengeance Paladin 5
S 15(+2, +1) 18, D 8, Con 14, Int 8, Wis 10, Charisma 15(+1) 16
Species: Wood Elf ASI: Great Weapon Master (+1 Str), Entertainer (Musician feat) background
Deity: Sheverash
AC 19 (Plate, defence). HP 44.
Features: Faithful steel, Extra attack, Channel divinity, Vow of Enmity, Fighting style (Defence), Paladins smite, Weapon mastery (Greatsword, javelins) Lay on hands, spellcasting (Slots 4/2)
Spells: Hunters Mark, Shield, Bane, Hold Person, Misty step, Find steed, Long strider, Pass without Trace, Druidcraft, Blade ward, Divine smite, 6 more.
Melee: Greatsword: 2 x attacks, +7, 2d6+7 (4 damage on a miss)
Has a a Fey Dire wolf 'Faithful steed' (Large Fey, AC 12, 25 Hp etc) that follows him around most of the time.
Bonus action Hunters Mark, then 2 x attacks (3d6+7) getting the odd third attack in from time to time with Cleave, or alternatively Divine smiting (at 2nd level).
Vow of enmity on anything it wants dead.
Pretty bog standard Paladin there.
Be shocked if any Lock 1/ Paladin 4 comes close at that level (or any of the 4 levels prior)
Next level (6th) the Multi catches up, but Mono then gets +3 to all saves.
Next level they're on par and remain as much for 8th level.
At 9th, 3rd level spells come online for the mono (including Haste and Revivify).
And so forth.
I've seen it done at my table, and the multiclass almost always finds themselves looking over enviously at the single classed PC.