Two persons, with two broadcaster, on different location to the same channel at the same time

Hey

me and my girlfriend share a Twitch account. We want to stream the same game on the same channel, at the same time, but from different perspectives.

We are not on the same network. We are in the same country, but that’s it.

We both have a broadcaster and I’ve been thinking about how I can source their perspective into my broadcaster.

It’s not an alternative to create a second Twitch account and then merge the two into Multitwitch or something like that.

I thought about things like NDI, but you have to be on the local network together and we are not.
Does anyone have a tip, advice or has anyone done it themselves?

Thanks!