That’s behavour should not be “init” related. I run OpenRC instead of SystemD and seam to have the same behavour.
I always run EVE from the terminal. I did notice that the last version of the launcher, when I close it while EVE is running, it “quit” but I don’t get the terminal back until I close the EVE.
But I know some bases console stuff, for example, if you add a & after a command, it go kind of in the background and free the console. While using a & on a graphic application will run the application normally but leave the console usable instead of locking it.
So I think that for your solution you simply have to add “&” to the end of commands.
WINEPREFIX="blabla" wine C:\tq\bin64\exefile.exe /noconsole /server:tranquility /ssoToken=00000000000000000000 /settingsprofile=Default /language=en /remotefilecachefolder=Z:/home/yournotgoingtohavethatone/SharedCache//ResFiles &
Maybe someone else have a better solution for that.
I did test and it work, adding the & orphan the process and it become child of init.