As I understand it HAdesigner is about to be replaced 'soon'tm, how much time do you have?
If not you could try a direct personal message to totallymaxed, I suspect he can better point you in the right direction as they are allready doing some work on this. (If I am not mistaken)
We sure are... and yes HAdesigner is bit of a pig to use!
We are using HAD to build our Dianemo UI2 based UI so we have had to get familiar with it!