The issue will be that the props will not be very strong compared to the commercial options. For the use you're looking at on those crazy 3D indoor style models like the one in the picture I'm sure that they would be just fine. But other than this specific application and perhaps rubber power free flight I would be afraid that blades would be at too much risk of flying off. Particularly if there was a ground strike that tweaks the blade in near the hub.

This would be the time to run destructive proof testing. Make your props and mount them to a much stronger motor capable of double the expected RPM. Use a wattmeter to run the "test mule motor" up to double the drawn power which should put the RPM up at around 1.5x or so of what you expect on the lightweight model. Be well back behind it during this. If it survives you can consider that design suitable for safe use at the lower RPM.

It actually sounds like a great idea. But just do the tests before trusting them. Granted a 1S motor with a huge prop isn't going to slice a jugular if the blade flies away. Likely not even a minor cut. But if it hits you or anyone else in the eye? That's a whole other level and even a slow big moving prop blade could do that sort of harm. So it's worth doing that sort of test just to be sure.