Tx C.T. and Rx C.T. tied together then go thru a cap to Ground.
There is no need to connect to Omega 2+ side.
Note that EasyJack is not a common part to get in a regular electronic store.
Not that regular but I think pretty available. For example, HR911105A. I got some from Ebay, ca USD4.5 per 5pcs:
Didn't have time yet to check them out.
I found much more difficult to find a human solderable solution for the USB protection circuit and ended up purchasing individual diodes.