Apart from working with physics, nothing comes to mind that could mess up attachments. If you do have a complex enough setup that prevents you from attaching reliably (does not seem to be the case here, though), consider doing the math instead:
You can have anything rotate around anything with any speed in any axis in specific radius.
Another dumb-clever way that works really well is a spring arm. I once made a 3d carousel menu (think early Tomb Raider) with dynamic springarm comps. The built-in camera lag works wonders as an interpolation shortcut. Nothing stops you from spawning spring arms and attaching actors at theirs ends - the length becomes the radius.
For something more nuanced, you could use a spline and drive any number of actors along its path: