Why warlock/wizard?
Would sorcerer be better since both are charisma based?
As for my own char:
For a level 20char I would have taken lore bard 18/hexblade2.
A skill monky who can heal, buff, debuff and with the right selection of non bard spells even damage.
As written above criminal or urchin background for thief tools, so I can also work as rogue.
Hexblade gives be some profiencies, the most damaging cantrip and I can use cha for 1h weapons.
For a lv 10 char I am not sure if 1 (or even 2) lv warlock is worth losing bard 10.
The bard could select 2 more spells from another class and become expert in more skills.
Bard is especially good for me, I can finally overcome my hatred for bards that I had since BG1, were the bard was my most useless party member.
Edit: I deleted some stuff were I was wrong.
Last edited by Madscientist; 18/04/20 05:44 PM.

Prof. Dr. Dr. Mad S. Tist

World leading expert of artificial stupidity.
Because there are too many people who work on artificial intelligence already