Best AI Video Generators for Complex Languages (FinTech Niche)?

Hey guys,
I’m looking to spin up some AI-powered video campaigns to promote my services in the FinTech / Tech sector.
The biggest bottleneck right now is the localization. I need to target a highly specific geo with a notoriously complex language (think a brutal mix of tonal structures like Chinese combined with the script/grammar complexity of Arabic). Standard AI voiceovers usually sound incredibly robotic or completely mess up the industry jargon here.
I need a software/platform that can handle:

• High-Quality AI Avatars / Video Generation that don't look completely uncanny valley.
• Flawless Text-to-Speech (TTS) or voice cloning that actually sounds natural in rare/complex languages, specifically handling financial and tech terminology without losing the native accent.
• Scalability: Ability to batch-produce video creatives for ad testing.

Has anyone cracked the code for this in 2026? What are the go-to tools or workflows you guys are using right now for non-English high-tier localized video production?
Appreciate any recommendations or solid pipelines you can share. Thanks!

Custom tools always works the best for this type of content.