Ring Stick Up Cam DC Power Input Range

To summarize my basic problem, I have an existing camera security system (old AT&T Digital Life) that the previous owner must have spent a lot of time and money to hardwire 12V DC supplies to power these cameras. Unfortunately, I can't get to the AC/DC converter and only have access to the 12V barrel plug output. Ideally, I'd like to plug this right into my new Ring Stick Up Cam, however it appears that this power input is 5V. Lots of times these inputs might have a large range (e.g. 3V - 12V) and if this is truly the case, I could adapt my existing 12V barrel plug hardware to a 5V barrel plug to work with the camera but I want to ensure the camera's DCDC converter can indeed handle 12V before I try it out. Buying a Ring Indoor/Outdoor power plug isn't an option since I don't have access to the wall plug and solar panels woudl be tough/ugly. Any thoughts? Thanks!