Thanks!

Things are strange sometimes... I already tried the openrepos version some time after posting my question here, but it was neither installable via clicking on it in Filebox ("invalid package") nor via command line ~ # dpkg -i vim....... ("... not user package")...
I was probably just being stupid and missed something back then.

Unfortunately, this version of vim really is ugly. In the preinstalled vi you can at least use the arrow and delte keys to navigate in insert mode. Here, this produces stupid capital letters and does not remove characters as desired...

Geez, one is not easily satisfacted!
At least, you can go back one step with 'u', which is not possible in built-in vi for some stupid reason...

Thanks though!