This is going to suck, OP, but that's the only way to do this. Stop trying to make it convenient for yourself and go in person because, as far as the City is concerned, you're responsible for paying those taxes.

You'll probably get multiple tax bills at the same time since they'll want back taxes; see my comments elsewhere in this thread since it happened to me 😒

I wish someone gave me that advice the first year I moved to Richmond because it would have saved me a lot of unnecessary frustration years later.