Oh, well, that would indeed pose problems, and I do not have this version of OSX, nor a system new enough to run it at that, to try anything personally. I may be able to rope in one of my mates with video stations, but I'm unsure if he is newer than 10.9, so similar reasons to meself.
Can't we just to a .dmg that has a softlink to the proper path on the local filesystem, with a 'copy files here' thing that used to be done for copying to ./Applications, or do those no longer work?
DMG Canvas may be worth a look.
In any event, AppleScript apparently does work, or did work, albeit for 'who knows' how long.
Continued gripes on apple...
Spoiler: show