I think Claude Code also already has the option to provide an API key directly for usage based pricing.
I'm a fan of having both a subscription and a usage based plan available. The subscription is effectively a built in spending limit. If I regularly hit it and need more value, I can switch to an API key for unlimited usage.
The downside is you are potentially paying for something you don't use, but that is the same for all subscription services.
Glad to see it converted to a blog post. Talks are great, but blogs are much easier to share and reference.