It doesn't specify, so I don't see why not.
Although packing as much heat as Neo in the office building scene from The Matrix may be a bit over the top, I do believe it would be legal.
Think of it this way, what's the difference between 2 guns (primary and BUG) and 3 (2 primaries and a BUG)? Or the difference between 3 and 4 (2 primaries and 2 BUGs)?
Per the LTCH:
So, as long as you legally possess (not necessarily OWN mind you) them all, it would appear you can carry as many as you want.The Licensee is hereby licensed by the Indiana State Police to carry on their person or in a vehicle, any handgun lawfully possessed by Licensee. ...
(BTW, IANAL so if you're really worried about it you might check with one).