This is not so easily circumvented. If an employee on H-1B transfers to another location, the employer is required to file an amendment to the H-1B petition and go through the prevailing wage determination again. From USCIS website [1]:
You must file an amended H-1B petition if your H-1B
employee changed or is going to change his or her place of
employment to a worksite location outside of the
metropolitan statistical area (MSA) or an “area of intended
employment” (as defined at 20 CFR 655.715) covered by the
existing approved H-1B petition
