Automating NanaBanana images & VEO 3.1 Fast clips — but it keeps breaking. Help?

I need your help — I've been building automations to generate NanaBanana images and VEO 3.1 Fast video clips using Google Flow, but I'm running into a wall and I'm not sure what the best solution is.

Here's the problem:

My current automation was built with Claude Code and works by clicking through the Google Flow UI. The issue is it's completely brittle — if Google Flow updates its interface even slightly (a button moves, a new feature shows up), the whole thing breaks. There's no self-healing, no intelligence. It just fails silently.

What I've explored:

Google AI Studio API — I know I can use it to generate NanaBanana images, and that would be rock solid. But using it for VEO 3.1 Fast video generation is going to be extremely expensive at scale.
UI automation — Works until it doesn't. Not reliable long-term.

What I'm looking for:

Is there a solution that is: