my dear Acorn.. i want to caution you about the hanging of your
heavy boatanchor of an accordion off of a skyhook..
our legs, shoulders, bodies, act as shock absorbers when
holding and handling our accordions, which is why the
backstrap system works, but hanging a heavy item off of
a hook or other fixed point (think of the Speaker cabinets
hanging off a chain in a church) requires a very strong point
of contact.. the typical backstrap metal bracket(s) on the top of
an accordion are probably not strong enough to handle
the accidental shocks.
you may need to find some thick available section of the body top,
where you can mount a stronger bracket of eyebolt, and
use some custom washer to distribute the pull force over as wide
a section of the frame as possible
in the bass chamber will be some electrical switching components
which could be sacrificed, and there will be a somewhat thick
cable/wire sort of thing that connects to a connector that feeds
another cable through the bellows that could also be removed..
since it is unlikely the original organ components actually still
work, sacrificing/cutting out this stuff is no real loss
good luck