Overworld sprites are kinda tricky. The allowed sprites are based on the sprite packets used. The good news is that Zeal, Dark Ages, and Last Village all use the same sprite packets, so you can use the Blackbird.
The Blackbird would be loaded at somewhere around the coordinates of 240, 1F0 - the actual values will probably be lower or higher.
The object loaded at those coordinates will have a sprite loaded as well. You can use that one.