One solution could be:
Step N°1
Keep the 2e and claim compensation from /e/ for the inconvenience caused and your time spent.
Step N°2
Install the 2e-emerald manually with /e/OS-S 2.7 (A12).
Alternative:
Upgrade the 2e-emerald to stock Android 13 …
[Certified] Android 13.1.1 for Teracube 2e Emerald (SN:2021)
… and wait until /e/OS-T (A13), which has been announced for months, is available.
Side note: The Teracube 2e (emerald) is rare and hard to get hold of, even second-hand.