I would not recommend using these tubes to prepare and store complete media because of the high risk of contamination. Instead, you could use these tubes for other applications in cell culture such as storage of spent media or preparation of reagents used in end point cell-based assays.
In a way, you would be reducing the number of single-use plastic items in day-to-day research. This would also have an impact on the amount of biohazard waste being autoclaved and incinerated, as well as generating substantial cost savings for your institute.