[rpcameron]

You can also use one backend as a SAT>IP server, and then use the other as a client to that SAT>IP server. The Tvheadend machine that acts as the SAT>IP client is the one that you connect Kodi to.

Will that work over the internet or just a LAN (and possibly a VPN)? I remember considering SAT>IP and thinking it was LAN only (though I may be wrong)

(I realise that the OP wasn't specifically asking about linking remote TV Headends)

After a quick search I can see nothing that would indicate you can't do Sat>IP over the internet, as long as you have the requisite ports open ...