If it only is the Play Store you want, you could try this …
https://forum.fairphone.com/t/fp4-google-free-android/76716/67?u=anotherelk
https://github.com/FriendlyNeighborhoodShane/MinMicroG_releases/releases
But be aware that even if you get the Play Store to work for you this way, /e/OS restrictions still apply to the underlying Google services many Apps from the Play Store would expect on the phone …
No, it’s not possible to install the genuine Google services on /e/OS, because /e/OS currently has microG integrated in a non-removable way, which tries its best to mimic those Google services.
And /e/OS includes further degoogling changes, which possibly could interfere with operating the genuine Google services reliably anyway.
Even if you install Google Apps like the Play Store (or Maps, or GMail, or else), in /e/OS the underlying Google services are still being mimicked by microG.
It is the nature of the Google services which microG tries to mimic that they can change. This can break microG compatibility for any given Google-dependent App at any given time, until microG catches up to the changes again, if at all possible.
This means that a Google-dependent App may work with microG at some point in time, and it may not work with microG at another point in time.
If you really, really need your banking App (or any Google-dependent App for that matter), in Custom ROM territory you would be better off using LineageOS in connection with the genuine Google services (installed e.g. via Open GApps ) and Google’s registration of devices running uncertified Android OSes for the legitimate use of Google services at https://www.google.com/android/uncertified .
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