When doing "plastic" surgery, it's always good to use some sort of pin to shore up joints. Drilling the holes will be easy and fine guage wire will do for a support.
CA, superglue, shoudl work.
Painting hte figures is a bit harder. After you reposition them and are satified with the joints being nice and smooth, prime them with enamel paint. Use an airbruish if you have one, a rattle can in several light coats if you don't. Let this dry touroughly. You should be able to paint with any type paint, the adhesion will still be fragile.
All that being said, do you really want to put figures in the aircraft? Perhaps putting the energy into detailing the visible areas would be a better use of your time.
But it's your model, your time, have fun with it.
Post pics.