Con Save class 1 / Bard 6 ... would boost the effectiveness of Concentration spells.
Paladin or Fighter. So that one could be Lore Bard, for the "multi" -casting at level 6.
Or just take Resilient Con feat.
Rogue 1 / Valor Bard 6 ... for a more skills based version.
Rogue 1 / Cleric 2 or Warlock 2 / Bard 4 ... is also a decent skills build.
Caster class 1 / Bard 6 ... would get all the spell slots.
Var Human for the feat at level 1.
Might be able to get away with a feat at class level 4, since you're stopping soon after.
Can definitely game that Stat system, for better synergy.
Aiming for a 16 , 16 , 14 , 14 , 8 , 8.