Shifting your tax home deliberately is a rather advanced question (although I'm well versed in ways to do it when it is not desired), and I'd like to know the answer myself. Obviously people want to get lower cost housing or better located housing when they transition from staff to travel. This is where they get into trouble when their recruiter suggests "just use your parent's address" so they qualify for tax advantage from the agency perspective (not from the traveler or IRS perspective unfortunately). I can make a couple educated guesses as to the right way to approach it:
1. Working an open ended job (staff, per diem, registry), even for just a few days, at your new location will effectively shift your tax home. Document in your own notes the initial reason for the move, and any changes in circumstances to start traveling (useful in an audit years later).
2. Working at your tax home location in general is one of the three pillars of the IRS definition. While it is only required to meet two of the three requirements, working at home helps make your tax home solid. Of course, in many locations it is not possible to find suitable work.
3. This may muddy the waters for some readers looking for loopholes, but having historical ties to an area is specifically mentioned by the IRS. So is living with family (but not just an address of convenience). So moving back to an area where you previously lived, or having family in the area would help.
4. Purchasing a home seems like a solid way to help shift your tax home. In fact, renting and keeping proof that your are actively looking to purchase (emails to realtors or notes about conversations) could be very helpful. That is often the way people move legitimately, rent short term while they look to buy.
Tax homes are complicated as it often comes down to a preponderance of evidence which is very individual and circumstance based and often not black and white. It is probably to complex for there to be a simple answer, but the TravelTax site would be a good place to search. Failing that, I would call him or email him - he will give you good advice for free. I might suggest copying this post and emailing him, especially if any of these guesses fit your proposed circumstances. He knows me well, and usually we are very close on such matters. The difference is that he is an academically well prepared tax professional who is specialized on taxes for healthcare travelers, and I am not. Which brings up the point is on something this important, you need to check even the most solid sounding of advice that you find on the internet like perhaps this post!