First of all if you have a P&E BDM, why do you need Serial Monitor?
What you say does not make sense, as if you have a P&E BDM, there is no need for Serial Monitor.
It's possible you might have secured the device. NOICE can not unsecure the device, but if you have a P&E BDM you can download a utility from P&E to unsecure.
If you loaded the project using the P&E BDM target (and not the SerMon target) then for sure SerMon is gone, but like I said why do you need SerMon?
You should probably consider taking the time to learn CW, as once you learn it, it is very nice.
Also, many of the beast samples are for CW.
Did you know that NOICE works just fine with CW?
It will load the .abs file.
If you really want SerMon back, what kind of board do you have?
Usually the OEM prepares a version of SerMon for their board, and you should be able to download it and burn it back with NOICE or CW. Freescale only provided a CW project to build it.