Hi,
The 18F67J94 (or, in fact, any of the xxJ94 devices) doesn't seem to be supported even by PBP3 (Supported devices).
I'd love for PBP to support other device families but as have be said, the 24 and 32 series PICs are completely different animals compared to the 12, 16 and 18 series. However, and I know the thread is old so the point may be moot but if 4 USARTs is the driving factor for going to a 32bit microcontroller one might think about taking a step back and re-evalutate. Take a look at the MAX3107 for example, 4UARTs with 128bytes FIFO buffers, SPI/I2C interface to the main controller.

/Henrik.