My direct email address is laukel AT waitrose DOT com -- replacing the AT and DOT, of course. If you send me yours, I can give you a link to the Kirby family tree I've already posted. But yes, if you do a family tree for the Australian branch, that would be great.
Plan to put Yorkshire (large area!) into your itinerary -- it's a beautiful county (or rather, it's now three counties) and was very much "Kirby country". Some of the most beautiful places in Yorkshire were farmed by Kirbys and are well worth seeing just because they are so atmospheric and lovely.