a Tentacle Whp. Seriously?

[M1nu4n0]

I was doing a Shadow Monk playthrough and having a blast until I encountered a significant issue during the final battle in Act 3.

After full transformation, my Monk became useless. The unarmed attack was replaced with a Tentacle Whip, dealing a 3d10 damage. Which is pretty ♥♥♥♥♥♥ compared to the normal Monk's Unarmed Attack. And I can only use my normal unarmed attack when I use Flurry of Blows but it costs bonus action and a Ki(Although, I get a Permanect Mind Sanctuary effect from a transformation so BA is not a big deal here, but Ki is.)

I hate respecing my character because it breaks so much immersion for me, but with Larian Studios didnt' think about this issue and there is no current solution for this problem, I go to Withers for respec but he has no option for respec because it is Final Battle? I dunno. It's quite baffling.