I’ve never done it personally, but with the Dante card installed the GLD should be able to either send or receive all inputs over Dante to do a digital split.
The main problem with this approach, compared to a traditional analog split, is that one console controls the preamp gain, but any adjustments to the preamp will affect level at both consoles. This could be alleviated to some extent by putting digital trim, rather than preamp gain, on the surface of the “master” console once preamp gains are set.