Yes, that’s what I would expect.
So the MIDI message would be formatted as:
B0 63 #1
B0 62 #2
B0 06 xx
Let’s say the device is on channel 16.
It’s zero-indexed, so we subtract one (15) and convert that to hex, which is F.
BF 63 #1
BF 62 #2
BF 06 xx
Portamento part 2 is 3/32
3 is the same in decimal/hex, so that’s fine.
32 in decimal is 20 in hex.
BF 63 03
BF 62 20
BF 06 xx
And xx would be the value used for control, with the valid range being 0-127 (00-7F).
If high-resolution NRPN was supported, you would have a fourth set of CC messages for the fine value control (BF 26 xx).