Yeah that would work, looks like that's what they have tried to make the ones available on their website. Silicone resin can be pricey though, I don't want to spend too much.If you can get the 3D file, then it would be better getting a mould made and making them from silicon or outsource the printing to someone with a better printer capable of doing rubber. Protolabs maybe?
Thanks, I'm requested to become a memberIf you have Facebook, join the AX enthusiasts group. Some people over there are working on similar ideas. https://m.facebook.com/groups/844602449446601
The owner of Shimanoax.com is a very active user there, he might be willing to share the 3D file.