Your best bet might be trying to incorporate the type as prefix into the name (i.e. extreme-key or low-key) and then use the filter of list() to filter for these. Though I am not sure that filter is also available on the web interface and not just via the JavaScript functions.
Just to chime in here, “bulk get” is a thing that’s on my radar as a feature; it’s true we don’t have anything that makes this simple right now, and this advice (prefixing) is the best thing you can do at the moment.
The last one especially, along with the same for normal Workers would allow a revert for Sites as well, in case something goes wrong instead of having to re-deploy if the fix is quickly possible.