In an Origin/Edge configuration it is strictly either RTMP or wowz. The alternative is as suggested above, and that’s to push MPEG-TS between the servers.
But the servers wouldn’t need configuring as an Origin Edge. Just live setups would suffice.
I’m curious… can MPEGTS be used as the protocol between WSE’s in an Origin/Edge or tiered environment? I’m not seeing anything specifically related to that particular use case.
You should also have a look at the “How to use MPEG-TS to distribute live streams” which contains more detailed explanations on how to push a Wowza incoming live stream to a third party destination (unicast or multicast), using MPEG-TS protocol.