Signing a newer version of a listed addon without queuing

Is it possible to submit for signing-only a newer version of a listed addon, so that we can have a signed latest release self-hosted (on github) while we wait for the listed version to be reviewed?

Ideally, of course, we would have the latest version always listed and available for download from AMO, but as that seems impractical due to the several-month long review process the next best option would be to keep the updating the AMO listing as frequently as review allows, but also self-host a latest version. The only issue is I can’t see how to simply just get that latest version signed.

Is not somewhere that we can simply upload an .xpi, have it pass automated checks, and download a signed version?

In general, that’s possible. However you need to change the add-on ID and upload it as a new add-on, as an add-on cannot be listed and unlisted at the same time.

Thank you for your answer - to be clear, having a self-hosted signed version of an AMO listed add-on is impossible, the only solution is to have two different add-ons: the AMO version and the self-hosted version, with different IDs. That’s a shame.