"Is there a temporary adhesive to bond glass and withstand 1400°F?"
Before this question can be answered, we need to ask for the definition of temporary. Only some materials will withstand up to 1400°F. Companies like Cotronics Corp and Aremco (to name a few) offer high-temperature adhesives. These adhesives are often modified with fillers like Alumina, Zircon, mica, ceramics, etc. that allow the adhesive to withstand higher-temperature environments. Some materials, including liquid materials or tape-type products, have a continuous service temperature of 1500°F, and a melting point of 2800°F. So in one sense, it is permanent at 1500°F, but temporary as you raise the temperature. Some epoxy systems can withstand up to 400°F and 500°F, so the question becomes - how long does it need to survive at 1400°F? If the answer is minutes, then finding a material that can survive short bursts of high temperature for only a little while may be sufficient. There are a number of different chemistries available such as silicone or epoxy. Typically, unfilled organic adhesives like acrylics and urethanes will break down long before 1400°F.
Other questions to ask are about which properties are required, such as: Does it (the adhesive) need to be clear or is opaque okay, or how do you want to remove the material? Unfortunately there isn’t a simple answer to this question. Some of the technical support groups at these companies may be able to help further, or recommend other options for you to consider.