Kitten oral fixation bottle feeding

Could anyone with silicone or crafty experience help me come up with a prototype for a more realistic nipple for bottle feeding? I have a 2 week old kitten that i’ve been bottle feeding but it breaks my heart to see him still look for a nip when cuddling his plushie. The nip tip that comes with the bottle is the generic one. Which seems to be the only option around. I think someone should take one of those purring and heart-beat plushies and add like a velcro strap with a silicone side that has nips on it. Different types and sizes and no holes, so they aren’t sucking on air and creating gas in their tummies. It doesn’t have to be silicone either, but that seems to be the safest and most used material for the bottle nips