In agreement with cce1302, don't worry about method of carry as long you have a valid license/permit to carry from any other state or country. It will be recognized as an exception to Indiana's code prohibiting handgun carry regardless of the issuing state's codes.
We've seen the arguments for various interpretations of "according to the terms thereof" found in IC 35-47-2-21(b) a time or ten, but in reality, the only possible charge would be carrying without a license in violation of IC 35-47-2-1.
I'd love to hear an officer explain that one - why he thought open carry would be somehow prohibited as a term of a carry license. Even if it is a more narrowly crafted exception to the issuing state's specific prohibitions, like a license to carry concealed, I've never heard of an example where getting such license in any way prohibits the carrier from opting to carry unconcealed.
Even in states like Texas and Florida, where open carry is prohibited, it is due to a law (rather than a term of their concealed carry permit) which makes it illegal there. Such laws certainly aren't applicable beyond the issuing state's borders.