Thanks, Johny! I may end up giving this a shot.

In the meantime, the first thing I'm going to try is HotkeyNet instead of AHK.

I used the post here: https://us.battle.net/forums/en/wow/...8205806#post-4

And I'm merging two scripts:
1. Two WoWs on one machine: http://www.hotkeynet.com/wow/wow-sample-two-on-one.html
2. PIP: http://www.hotkeynet.com/wow/wow-pip.html

Since PIP uses F1, I removed F1 from the two-on-one script. I also added in some other keybinds I use (Lctrl+Numpad0, Lctrl+Numpad1, etc)

I use a Logitech G600, and I map the 12 side buttons to Numpad0-9, multiply, and minus.

This is what that section looks like. I will test it tonight:

Code:
//-----------------------------------------------------------// DEFINE HOTKEYS FOR ALL KEY COMBINATIONS THAT WILL GET
// SENT TO BOTH WOWS. ADD MORE KEY COMBO'S IF YOU WANT. 
//-----------------------------------------------------------
<Hotkey ScrollLockOn A-Z, 0-9, Plus, Minus, F2-F12 except W, A, S, D, Q, E>
<SendLabel w1, w2>
<Key %Trigger%> 


<Hotkey LCtrl Numpad0, Numpad1, Numpad2, Numpad3, Numpad4, Numpad5, Numpad6, Numpad7, Numpad9, Numpad9, Numpad1, NumpadMinus, Multiply>
<SendLabel w1, w2>
<Key %Trigger%>