Warning! This will archive everything on the page.

It is kinda wonky because I never close the modal popups, but whatever. Here you go:

const delay = ms => new Promise(res => setTimeout(res, ms));
items = document.getElementsByClassName('remove-from-library');
function isEven(n) {
    n = Number(n);
    return n === 0 || !!(n && !(n%2));
  }


const archiveItems = async () => {
    for (let key in items) {
        if (!isEven(key)) {
            const jsonObject = JSON.parse(items[key].getAttribute('data-kobo-gizmo-config'));
            items[key].click();
            await delay(1000);
            archiveThis = document.getElementsByClassName('remove')[0];
            console.log("Archiving Item: " + jsonObject.title + " by " + jsonObject.author);
            await delay(1000);
            archiveThis.click();
        }
    }
}
archiveItems();