With the provided standard Tech-Lock style belt clip, IWB carry is not really possible. The clip is serviceable with OWB carry in an appendix position though and I found it would conceal well even with just a polo or a tee shirt. This is thanks to the slim overall profile of the handle.
The ideal IWB option is to install either a soft loop or a steel clip like the offerings from Discreet Carry Concepts. The DCC clips are now an add on option from MilMak when you order a new blade. The way they mount up looks like it gives the blade a slight reverse can't in the waistband which should help with comfort and concealment a bit.
Also, Blade Rigs is now listing the production CCW and CCW-L blades as a standard option for their IWB sheaths.