Since the topic was opened, the original post has been suspiciously altered .
The exact way to get White Wolf seems to still be a mystery,except to those that claim they know exactly how it works,but will not tell anyone, which in some ways makes sense,much like the logic behind the blocking of the pioneer tiles, which was/is so annoying for the majority of players.
As to your 'no rush to get White Wolf', I have mixed opinions on that.
The gold reward is nice ,but if you gain little benefit from the other bonuses, it can be costly to get the award slowly or quickly,assuming that it is necessary to do as you suggest and kill ubers.
I have also read the discussions about how the White Wolf was changed, making it even more difficult /expensive to accomplish,when they introduced minimum palace levels for many of the awards, which references me back to your no need to rush, to complete.
Many of us thought that over pioneer, skald, and the rarest viking, and others slightly more complex,and they did the dirty on us, and they are now out of the easier reach they once were.
Later addition
Regarding your seemingly sound suggestion about gaining invader knowledge first.
Do you have personal experience on the time scale to complete the invaders knowledge tree, and the actual benefit from using the royal guardsman equipment?