Non-metal canning funnels exist, but how can you use them safely? (For example, Ball makes one)
Specifically, is it possible to sterilize them safely, without damaging the product?
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You can sterilize using a chemical agent that is used to sterilize baby bottles.
There are plenty of plastics that can handle high heat, and I've never seen anything sold as a "canning funnel" that couldn't be put into boiling water for sterilization.
I would assume that the packaging would contain sterilization instructions, but you can also see if the company has that info on their website.
(I tried looking for info on Ball funnels, but Ball actually licenses its logo to Rubbermaid for home canning jars, and I didn't see funnels on that site. I don't know if they license the logo to another company for other canning-related home products.)