What do you want to take pictures of? If planets and the moon, you will get far better results using a modified webcam and stacking software than any DLSR. Besides, I'm assuming that's a big camera and that mount doesn't look so sturdy...

As for finding a 4/3 t-ring... I guess you can wait and hope someone makes one, or get an adapter to another standard and then buy a t-ring for that standard.