Is there any way for Archaon to gain new regions after becoming Lord of the End Times?

I reached short campaign victory and chose to become the Big Bad, which means I cannot occupy any settlements ever again. Which has been fine, my economy from vassals, plus the income from razing has been significantly more than what I need. However, now that I've spread quite far from the lands that I do own, raising a new army means I've gotta spend around 20 turns just to get them into enemy lands. Is there no way around this, or am I just stuck with the armies I have?