crusading is about the only way...

I ended up changing several things as regards the knight orders, because as things stand in vanilla, you have an increased chance of getting hospitallers over templars, the hospitallers fight better (they get a 3rd armor upgrade which the templars don't, and they obey orders which the templars don't), and the st. john's guild house gives a health bonus compared to the templar nothing.... so it really just ends up being a complete templar shafting

if you really want templars though, you can crusade a lot, and eventually you should get them...