#2 Set up an interim championship
Generally speaking, WWE has a mindset that the champion should defend his or her title every 30 days, but since this is entertainment and not a regulated sports league, that rule gets ignored from time to time.
More often than not, when someone is injured or their name is Brock Lesnar, WWE just doesn't bring attention to the missing days without a champion.
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Sometimes, though, they've enacted a sort of "interim championship" philosophy, such as the Intercontinental Championship feud between Shawn Michaels and Razor Ramon that culminated in the first-ever ladder match at WrestleMania X.
If Asuka is going to be taking longer to heal than NXT TakeOver: Houston, there could be some kind of tournament, battle royal or anything else to determine an interim champion who can lead the division until she's ready to return.
Then, whether it be on a regular episode of NXT or preferably at NXT TakeOver: Philadelphia in January, Asuka can demand a match with the interim champion to put both belts on the line to determine who is the undisputed real champion.
Ideally, this other person would be Ember Moon, who is not only the woman responsible for the injury in the first place but the best suited to take Asuka down.
However, it can be anybody who is significantly built up enough in the meantime as the current champion while Asuka is away healing.