Something different: Zetti and family growth

For the current occasion a question in the round: Who of you shares his zetti with offspring? Short story about it: I was with the recently and asked for child seats, which at the same time fit in our Z4 AND in our 5er (Touring of course ) which we get soon. Answer: Isofix child seat from BMW is very expensive (about 500 €) and is only allowed for BMW. Switching into other car is then impossible. So for me Isofix would not necessarily be in Fra Ge. Then a problem with the Z4: with a child seat on the passenger seat the passenger airbags must of course be deactivated. And now the hammer: this is not even possible with Bj. before the middle of 2004. No, the airbags have to be “physically” deactivated, the belt shoulder has to be removed – the conversion would take about 3 hours, the rear-fitting also. If you take a “normal passenger” with you, of course, this can not even be retrofitted so easily, which then drives without airbag We will definitely not separate from Zetti, another car with space is also there. What did BMW think about it? Is the Zetti really an ego car? Even our Alfa 147 year 2002 has a simple passenger airbag deactivation with the ignition key. I find that pretty…. What do you think about it? Do you have a better solution? Greetings Prian