Lore-based Question: Khalid & the Harpers

So, I'm fooling around with a Bard on NWN2, and I realise that I've accidentally made myself eligible to take the Harper prestige class.

This gets me thinking about Jaheira and, more to the point, Khalid...
Now the NWN2 engine requires spellcasting ability in order to become a Harper which, as a basic scrapper, Khalid does not have.

So, to any Lore-savvy bods, is Khalid a legit Harper? Is the spellcasting requirement just an edition-specific thing?
Or, do I now have reasonable grounds to keeper Khalid into something more interesting (in the same way as I do with Minsc)?