I think the flex induction cooktop has been out for a couple years, hopefully someone who owns it can give feedback (that won't be me). If you want to have a single gas burner in addition, though, I don't see why the flex induction cooktop would stop you from doing that? You could just get it from a different manufacturer and install it close to the induction.

I will warn you, however, you probably won't get much feedback on the side swing Benchmark ovens. They're just too new. Based on what I've heard about previous Bosch ovens, though, I would call it a "safe buy"