I'd like to see when and where Trump "vowed to use the Federal Vacancies Reform Act". Looking through the details:

The Vacancies Act directs that the first assistant to the vacant office is the default acting officer. However, the act also authorizes the President to direct a presidentially appointed, Senate confirmed officer or a senior agency employee meeting certain criteria to serve as the acting officer. (5 U.S.C. & 3345(a).)

So it looks like if Trump can make his appointees into 'senior agency employees' first, he can promote them to 'first assistant' to each vacant office and then they can fill the positions?