The phrase "act as temporary replacement" is correct and usable in written English.
You can use it when referring to someone who is filling in for another person for a limited time.
Example: "During the manager's absence, I will act as temporary replacement to ensure that all operations run smoothly."
Alternatives: "serve as a temporary substitute" or "function as a short-term replacement".
Johnson then suspended him pending the next meeting of Congress as permitted under the Tenure of Office Act; Grant agreed to serve as temporary replacement while continuing to lead the Army.
The seat would be decided in a special election, but until that can be arranged, the governor of Massachusetts is obliged to appoint a senator as temporary replacement.
An ideal scaffolding material would act as a temporary replacement for the tissue that is lost or damaged while promoting its healing/regeneration. Amongst diverse group of materials, polymers are the most widely investigated for various applications.
Biomaterials have been designed to serve as temporary replacements of the ECM for tissue regeneration in vitro and in vivo.
ABC employed morning-show host Charles Gibson and correspondent Elizabeth Vargas as temporary replacements for Jennings and only in December did it name Vargas and correspondent Bob Woodruff as his successors.
Took 50% pay cut to start own car-leasing business; offered rentals as temporary replacements for stolen, wrecked cars.
Backed by boss, took 50% pay cut to start own car-leasing business; offered rentals as temporary replacements for stolen, wrecked cars.
The organic nitrogen compounds act as temporary poisons in hydroprocessing catalysts besides being coke precursors.
The scaffolds not only act as temporary support structures for bone ingrowth and tissue regeneration but also provide temporary biological functions.
When networks fail, carriers deploy trucks, called C.O.W.'s, for cell on wheels, that act as temporary cell towers.
This correlation between Tg and m for different molecular weights indicates the presence of a physical network, where H-bonded end-group clusters act as temporary crosslinks.
