When i used to play my rogue, i had 2 rows. 1st row with keybindings for main abilities and 2nd row for mounts etc. When i went into stealth, my abilities from stealth where just on my 1st bar with my keybindings. Perhaps try going into stealth and drag the stealth abilties on it.
If I understood your request correctly:
/bt > select bar (e.g. Bar 1) > State configuration > Stance configuration - Stealth (set if for desired bar e.g. page 5).
This will change you bar 1 into bar 5 when you go to stealth. The keybinds will remain the same as the bar you cahnged (in our example Bar 1).