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I figured it out!

Since only one NRPN value is allowed in the BCR2000 for both the MSB 
(01H) and LSB (20H) from the example above, you have to do the 
following:

1. Determine the decimal value of both the MSB and LSB (01 and 32, 
respectively).

2. Multiply the MSB (still 01) by 128, and add it to the LSB 
(128+32=160).

3. Enter the result (160) in the NRPN field, and the range of values (0-
127) in the corresponding Low and High Value fields.

It works well, however I'm noticing that NRPNs take longer for the 
Motif/PLG150-AN to decode than CCs do, which can be problematic when 
both controller and note information are being sent at the same time.  
I guess the moral of this story is to use CCs whenever you have a 
choice between CC and NRPN.

Thanks again Jon for your reply...

Greg