One of the desks I worked on (SSL) had a very cool mod routing busses 25-32 to the cues.
Each musician had his / hers own 8 ch mixer, and they would mix their own cans.

I know the VLZ is no SSL but there's a nice trick on the stock SSL 2:

U may send the mix 2 cues, then pressing any send button on the CUES/SLS (Studio LoudSpeakers) row U may ADD an individual send 2 the cans mix.

The performer will b getting ur monitor balance PLUS any channel boosted on the individual send.
(Him/Her self 4 ex.).

This is very useful when switching quickly between titles, saves the time of getting the balance twice.
This way U also make sure the performer is getting exactly what ur monitoring + himself a bit louder.

In many cases the producer may work 4 hours trying 2 get the artist in time with a gtr line that was not in the cans 2 begin with...

In other cases the performer will ask 2 kill some tracks in his / hers mix, or gradually change the balance 2 the point where it makes no sense. By that time, the performer is so confused, he'll just leave it like that and performance will suffer.

If U r building a box, U could mix the monitor o/p (buffered) with the cans' send, and route it to the cans.

Peace,

Zooot