No problem with a hook on a S76, it will be installed "inside" the fuselage so only the bottom part of the hook (5000 lbs unit) will stick out.
You can use the S76 for sling load work, but there is far better helos for it. The pilots vision outside for sling work is no good and the mirror installation is not the best.
Depending of the weight of the load, it has high Vne with load on though.
Very stable helo for precision work also.
CB