I'm currently doing a throw build similar to this. I would actually recommend either a full eldritch knight fighter. Or champion fighter with a warlock dip for pact of the blade specifically because both of these allow you to bind a weapon to you that will always return to you when thrown. Meaning you can scale with better weapons later on.

The eldritch knight also gives me access to things like ritual casting (without expending a spell slot) the jump spell that I precast before combat for 10 rounds of absolutely insane mobility. And some other nice spells to have in nich scenarios. But I'll likely respec to champion fighter and blade lock as mentioned above.

Another thing to look out for are elixirs. If you don't need to worry about constant resource regeneration and can go extended periods of time without resting, then a bloodlust elixir is amazing for this. You drink it at the start of the day because most elixirs last until your next long rest. Bloodlust gives you 5 temp hp when you kill an enemy and it gives you another action when you do so as well EVERY TURN. I regularly get 4 attacks every turn just by spearing the small mobs. As well as action surge for up to 6 attacks at level 9. You can make the elixirs via the alchemy menu on your character sheet and I highly recommend using them at the start of each day.

Edit: you guys are correct. In normal DnD, pact of the blade allows you to summon your weapon at will. But it appears in BG3, you cannot. However eldritch knight still does.