HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

In my opinion, since you've already reached the point of making changes that directly affect the game's mechanics, it would be better to do it more officially and ask players what they would like to see. You can't just introduce things like nagabanks and obelisks in regular updates. Ideally, in my opinion, this should be done in a separate patch, like M200 - (like regular_HW, as Leader wrote). There shouldn't be any problems with using it (some people are worried for no reason), but if you add everything to the main version, then you definitely won't be able to avoid problems.