Splitting instrument headings

Hi there, I’ve recently imported an .xml file whereby the horns are arranged as such:

I want to delete the instrument name and have it such that the top stave reads “Horns 1, 2” and the bottom stave reads “Horns 3, 4”. How do I do that?

The obvious solution would be to use the Paste Special > Explode function to explode out the two staves to four separate horns, then turn on condensing (and set Engraving Options > Staff Labels to give you what you want).
Anything else constitutes a workaround, in Dorico 3.