If you give it good light and extra humidity it has the best chances. Hoyas can come back to live from leafless "sticks" but it isn't a sure thing. I always put mine in an aquarium when they look like that and often, right around spring, they'll produce a new leaf. If it's a larger plant, I'd try a pebble tray, or maybe put a bag around it.

I wish you the best of luck!

Are there any leaves left on the plant? If not then just be sure to keep the potting mix only slightly moist or it will rot the roots.

A potting mix as you described will do just fine. If the orchid mix has perlite and charcoal or other additives I would be suggest mixing it 50/50 with potting soil. You can even do 2/3 orchid mix and 1/3 potting soil but you will have to water more often. Also when you repot use a small pot just a little bigger than the root mass.

Mike