If you wanted to go the "no temple" route, you could have the Jedi be spread out all over the galaxy kind of like how the force is everywhere. This doesn't really work though because how would the empire wipe out the Jedi if they are spread out. Also, another idea I had is what if the Jedi have locations on different planets throughout the galaxy that have a crystal that would allow them to communicate across the galaxy. This would get rid of the idea of a centralized Jedi Temple. I got this idea from the Seven Seeing Stones in the Lord of the Rings.