Hey, thanks for reviving the idea!
I followed the EIP-1829 discussions and some other contents. Then, I found EIP-1962 which is a continuation of EIP-1829 by Alex. It seems that the problems in the implementation later revealed EIP-2537 which was planned to be included in Cancun upgrade, now postponed.
Apparently, generalized curve implementations failed and were replaced by specific ones with EIP-2537 ([notes] by @timbeiko (https://twitter.com/TimBeiko/status/1235931932644564995?s=20) from an ACD call).
I would love to hear the ideas of those who have worked on precompiled contract implementations for curves about the previous experiences and this proposal! @Recmo @shamatar @ralexstokes @kelly