The solutions above
Italic - and \Bold -
work inside of Paratext. However, in addition to correctly turning italics and bold of inside of PrintDraft, they appear to add an extra “-” at the beginning of the PrintDraft file.
I would suggest that a better solution would be to use \Regular, unless someone knows of a reason to avoid that. It appears to turn off italics and bold in both Paratext and PrintDraft, and not have the residual “-” mark.