What do you mean by "virtual Midi ports" ?
Reaper can handle as many Midi devices as you like to.
In Reaper any Midi stream can be routed using up to 16 "Midi buses". You need to define them in the Midi Routing dialogues. Technically this buses a an extension to to standard Midi channel paradigm, resulting in 256 bus/channel combinations.
Anyway, all this holds for Midi, and Reaper itself does not provide a "routing" between OSC and Midi.
You can use OSCIIBot to do a translation between OSC and Mid, and Loopmidi to feed the resulting midi stream to Reaper.
-Michael
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