Reprogram from scratch
If you are particularily skillful with excel and you have a CDE capture file of the SX200 programming, a lot of the programming can be done with Importing forms.
Bay connections are via CIM or FIM ports. Depending on how many bays you have and what type of connection (FIM/CIM) and what type of 3300 controller you may or may not require CIM/FIM modules.
The SX200 bays MUST have BCCIII cards and be of the ELX type (4 serial connections on the back - Maint, Printer, J10 and J11)
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Occam's Razor - All things being equal, the simplest solution is the right one.