here is an example of engagement-like silicon rings. but like i said, not really customizable. but at least it’s a start! best of luck to you :)
Rinfit Designed Silicone Wedding Ring for Women Set of Thin and Stackable Rings. 3 Pack & 4 Pack. Affordable, Comfortable, Soft, Metal Free Rubber Wedding Bands. Durable Wedding Ring Replacement. https://www.amazon.com/dp/B07L3NWCVK/ref=cm_sw_r_cp_api_i_P8IOFb9FC6E4Z?_encoding=UTF8&psc=1