There are essentially two routes you can take. If you want to go the Android route and use Libby directly, you can get a Boox Poke 5 (6") or Boox Page (7"). There are two types of updates that apply to Boox devices -- the Android version and the Boox version. Onyx releases new software regularly, and old devices receive updates for many years with new features (and new bugs).
The Android version, however, never gets updates, because Android updates are tied to the SoC, and Onyx uses old hardware to cut costs. If a Boox device ships with Android 12, it will always be Android 12. This limits your ability to install new apps, but you can continue using the device with existing apps indefinitely.
The other route you can take is to use Calibre to manage your library loans. Libby allows you to download ACSM files, which you can load in Calibre via the DeACSM plugin. AFAIK the plugin also supports library loans, so you can return books you've finished directly from Calibre.
Since you're loading the books into Calibre, it doesn't matter how many libraries you use, and you can bypass the sluggish performance on the Clara 2E by converting your books into KEPUB to access the faster reading engine on Kobo devices.
The Calibre method is less convenient, since you can't sync library books directly to your device, but it's free, and it avoids the hassle of having to learn Android.
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