Since there is no patern for the translation you will have to create seperate pretranslator entries for each incoming DID and then replace it with the extension. There is no way to do a strip and append.
I would create a hunt group, like 4500, and place all extensions you want to receive these calls. then import a dial plan update. See below for sample.
As a rule I also ask the telco to send 4 digits, makes it easier with a 4 digit dial plan. If the DID matches the telephone ext, there is no programming needed on the NBX side.
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