Matt. I have done refresher training with multi thousand hour CPL holders in RAA aircraft.
Have also converted several heavy jet pilots onto RAA aircraft. Is your hubby flying for the airlines now?..If so, why would he need to get an instructor rating?
Mates rates. I'm not sure what award they fall under. Some schools have instructors still doing it for the love, although this is certainly not the norm any more.
I Pay My senior instructor $25/ flying hour and a $40 retainer if she is at work all day. 2-3 hour (flying) days are pretty standard. Not going to get rich but well worth the drive to the airfield.
Hope this helps.