Well, the result achieved for vanilla will probably be pretty similar although we use scripting choice and that ancillaries are only used for displaying the emblems (so they dont impact on stats as the general only retain a nominal claim to a lost region/title).
I'd point that I opened my thread about heraldry rather early (less than a week after game release or so) so you don't steal away any fire and thunder no worries even if the further developements and merging with alpaca's project were done behind closed doors :)