I personally wouldn't, but everyone's risk threshold is different. These cartridges weren't designed to be used over and over. Theres a risk of degradation, specifically with the stoppers. Proper sterilization is done with heat or chemicals. UV sterilization is a thing too, but it is meant for hard smooth surfaces and only sterilizes what the light touches. The cartridge itself can be sterilized with UV but I'm doubtful about it's efficiency with the stoppers.
When I finally get a pen, I'll be tossing carts after one use. They cost less than $1 each and are used multiple times before being emptied. I'd rather spend a few extra bucks each month than take the risk.