I can only recommend the Fiscon / Kufatec solution for retrofitting. I also added it to my wife's 1 Series (EZ 10/2008, Business Navi).
Installation is relatively easy if you don't have two left hands (I was very careful at the time and was finished after 1.5 hours). If you don't trust yourself, ask a friend - but it's not rocket science.
The control of the FSE via steering wheel buttons and navigation system is possible, the voice output is via vehicle speakers, the voice quality is very good. Even music can be played on my smartphone via Bluetooth, but I had to do without the previously installed CD changer.
When choosing the right variant, you have to be a little careful: it depends on the month of manufacture and the specific navigation system installed. Visually everything looks exactly the same with your 1 Series as with my wife, the month of manufacture could also almost match. Nevertheless, I am not completely sure whether the linked device would fit you.