It's unlikely you'd be able to continue Criminology in one place and other A levels elsewhere. It's unlikely to timetable and the Criminology sixth form won't get any money for you unless there is some form of agreement between the 2 sixth forms.
If I've understood you correctly, next year you're intending to complete 3 A levels and take AS in 2 more (so 5 subjects in total). That's a lot of work and far more than you need to do. Also, there's no guarantee the 4 subject AS/A level combination at college would timetable (or that they'd let you study 4 subjects) - have you checked this?
If you're applying to university the some offers are grades based and some are points based. A grades based offer will not consider 2 AS to be equivalent to one A level. For points, an AS at a certain grade is worth 40% of the points of the same grade at A level.