Looks good,
But your stations can be restricted by TGARS instead of the PRE table SCL so you can allow 7 to be dialed for the XLAT 1.
Since your only concern is the operator, or who ever is at the console, him or her will not be able to dial any number starting with 7.
This is the only way you can restrict the console by controlling a specific digit since the console cannot be restricted by a TGAR and controlling the attendant is done only with the NCOS in load 15 but this only works through NARS/BARS, Let me know how it turned out. Good Luck
RBTCOM