Triple A teams (wikipedia)
For something in the ballpark (figuratively and literally) of a 40 (normal) home game absence, a Triple A affiliate can represent some playing time in the "home away from home city". So when the West Coast Athletics are playing home-camped in Vegas or on the road elsewhere, the Triple A affiliate could play in Portland. They could be called the West Coast or Westward Warriors. Or the Portland-Vegas Express.
Perhaps the drempt-up Truckers or Roadwarriors of Wyoming could be the West Coast affiliate.