I just implemented this system. Works great from what I can tell. Thanks so much for sharing! One thing to note is that the quick wizard for Isboxer by default uses the slot variable keystroke rather than the FTL slot modifier keystroke. If you wanted to use the default isboxer, you'd need to use Ctrl+Num1-4 and Alt+Num1-4 for the follow and assist macros.

Not a huge deal either way, but did want to point that out for others that decide to use this.