Maybe I'm misunderstanding but I thought this would work. Ctrl F5 goes forward, Ctrl F6 goes backward, and they always stay in synch.

Code:
<Hotkey Ctrl F5> 
    <Toggle>
        ... do stuff for WoW1 in foreground
        <SetToggle 1 Hotkey Ctrl F6>
    <Toggle>
        ... do stuff for WoW2 in foreground
        <SetToggle 5 Hotkey Ctrl F6>
    <Toggle>
        ... do stuff for WoW3 in foreground
        <SetToggle 4 Hotkey Ctrl F6>
    <Toggle>
        ... do stuff for WoW4 in foreground
        <SetToggle 3 Hotkey Ctrl F6>
    <Toggle>
        ... do stuff for WoW5 in foreground
        <SetToggle 2 Hotkey Ctrl F6>


<Hotkey Ctrl F6> 
    <Toggle>
        ... do stuff for WoW5 in foreground
        <SetToggle 1 Hotkey Ctrl F5>
    <Toggle>
        ... do stuff for WoW4 in foreground
        <SetToggle 5 Hotkey Ctrl F5>
    <Toggle>
        ... do stuff for WoW3 in foreground
        <SetToggle 4 Hotkey Ctrl F5>
    <Toggle>
        ... do stuff for WoW2 in foreground
        <SetToggle 3 Hotkey Ctrl F5>
    <Toggle>
        ... do stuff for WoW1 in foreground
        <SetToggle 2 Hotkey Ctrl F5>