Not to say that it doesn’t exist, but I have never found a TPE that can top silicone’s flexibility and durability.
I am currently working on a project that needs a flexible material for a valve. I have burned through about a dozen TPEs. None of which come close to the performance of silicone. Unfortunately, silicone is definitely a specialty material that needs to be processed in a segregated place. If you run silicone and plastic molding tools in the “room”, you will get bad plastic parts.
Also, if you are doing a 2-shot, the silicone will typically only adhere to PC. I don’t know if that is relevant but it is a limiting factor of silicone.