2021 Way to use a steam Version with an non-steam account?

[Pino1536]

For some games I bought later a steam version only to have the launcher there. (ESO for example)

Is there any way to do this for FF14? I tried it with the steam trial download but if you login it shows that you account is not an "steam service account" or something.

What happen if you completely overwrite the steam downloaded launcher (steamapps folder) with the non steam launcher (from the non-steam exe)? Same happen?

PS: If you ask why: Its a mix of having it always in you library, a full speed download, real steam features like time tracking etc.