The PRs to stabilize the archive_* RPC methods have now been merged (see Stabilize V2 archive RPC methods by jsdw · Pull Request #8104 · paritytech/polkadot-sdk · GitHub).
This means that the new, stable archive_v1 RPCs will be available from polkadot-sdk release stable2506 which is published at the end of June (see the release schedule here).