From his children's baptism records, it looks like he had dropped the "van den" so no worries there. It probably became Bush after his time, assumably since his children's baptism records read "Bosch". The one exception to that is if there is an actual record somewhere reading "Bush". Bosch vs. Bos is the worst (just like C vs. K) and has been recorded interchangeably at the end of Quackenbosch and places like Flatbush and Greenbush. In my experience with it, I would say it should be Bosch, maybe Bush as the CLN and Bos as an AKA.