Anki’s scripting language is Python and add-ons are basically just fancy scripts. But I assume you would like an interface inside Anki that uses a simpler language and doesn’t require looking at the source code?
The amount of users who would use such a tool, but couldn’t be bothered to write their own add-on is probably quite small. So while I would like such a thing to exist, I don’t think it’s worth the huge effort it would take to build and maintain it.
What you intend to do is really quite simple. I can only encourage you to write a tiny add-on for it yourself. Just ask, if you need help.
That’d be hard to ensure.
On the other hand, a small add-on for a specific purpose that uses the designated hooks in Anki’s API is likely to run on a lot of future versions. And should ever an update be required, it would be very simple to do.