I get divide by zero errors when I run the old versions but it should work on any version, the current version of Chord Picker uses CTRL+F2 or right click Edit Chord, not sure when the Edit Chord option came in but if 2011 has that you should be right else you could modify it to use ALT+F5.
Either way it will insert the chords but might not add remove rest, shots, holds or pushes.

EDIT:
I found my old hard drives and ran BB from it, the only thing that needed changing was when you Edit the Chord in 2011 the chord is already highlighted but in 2018 it's not so i just took the highlight line out of the script.

For Earlier Biab versions ONLY:
Exe, script and bb.jpg
https://www.dropbox.com/s/iad33ui9imba8wn/Biab%20Chord%20Picker%20beta%202.0f%20BB2011.zip?dl=1

Script and bb.jpg only
https://www.dropbox.com/s/9z4d5iowpvcs3h5/Biab%20Chord%20Picker%20beta%202.0f%20BB2011.ahk.zip?dl=1