The safest way to do this is to add your off instance account as a moderator.
If I see a mod that hasn't been active for a year, I'm probably not going to reach out before removing you. It'd be nice and I've done it in the past, but it's a lot of maintenance overhead when we have as many abandoned communities as we do.
Another thing that helps is keeping your report queue clear. That's the biggest thing that prompts us to look at inactive mods.