Kia Carnival Engine cactus, anything else fit in it?

A fiends sister with 4 kids made the mistake of buying a Carnival a couple 
of years ago, last week it broke the timing belt on the freeway ,
apparent;y 
a common problem for themdestroyed the head and possibly the bottom end, 
quotes for $7k to fix, no second hand motors to be found apparently or
worth 
risking, she owes $8k on it still and can't afford to pay it out to sell
it, 
any ideas on if something else fits in these things easy, is the V6 motor
a 
Toyota, Mazda or Nissan donk