/e/OS is based on LineageOS. There’s no official (in their terms) LineageOS for the device, and nothing unofficial I can see on XDA.
There are things you can do without /e/OS. Using a Google account is optional in Android for a start (just as a general reminder, I don’t know whether you use one), and you can uninstall a lot of preinstalled Apps … Uninstall default apps - #29 by AnotherElk