Thank you for the reply and for mentioning pyHanko!

Yes, it is in Python and much more powerful/comprehensive.

I personally really prefer Python too, but unfortunately it is too heavy for Cloudflare Workers and similar edge environments (due to the WebAssembly overhead etc). It is survivable, but consumes significantly more resources.

That is exactly why I created this tool - it stays small and lightweight, and definitely would not grow into full signing support.