In all honesty, it depends on how much you plan on using it. It can be very effective at our lower level, especially if we need to get someone to see things our way, but as the game goes on, it becomes less and less effective IMO.
However, in the end, it all comes down to how you want to play Orpheus' personality and thus far, I do think it would fit him, but again, that is just me.
Did you sink a point into Speak Languages to pick up Undercommon? If I recall, it is the only skill that you can't use a modifier as a ranking board. Although having more people who can understand the skulks could be a handy thing.