I'd make sure you discuss this with other engineers who are on-call. If everybody agrees, you could declare together that from now on, on-call is your only resp

I'd make sure you discuss this with other engineers who are on-call. If everybody agrees, you could declare together that from now on, on-call is your only responsibility and you won't be taking up other engineering duties. Of course management could fire you for that, but then they don't have anyone on-call anymore, and they're unlikely to find new engineers willing to add it as an unpaid responsibility.