v4 locks down the config UI, so they enforced the Tx and Rx units to work as a pair. As the blog describes, this product was never intended to be used as a configurable uni/multicast device, which makes the $40-$50 price tag a steal.
Are you still using your HDMI encoder? Did you find a solution for IR blasting?
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The encoder was was sock-drawered after a while in-lieu of the simple-to-maintain HDHR Prime. IR was controlled via a Switchbot Hub.
If/when the Prime becomes a doorstop I'll come back to this setup, in addition to incorporating the relevant ideas from this fellow (like the use of the TivoCommander app):
A really popular programmable IR blaster is the Broadlink. They make a few different models, which even include RF.
I had an app years ago that managed the control of them, but they have direct support in Home Assistant now. And even if you don't use Home Assistant for anything else, it'd be worth using it just to control this, just because it can be very tedious.
These have been adopted a TON by home automation fans, so there's lots of projects to control them now.
https://www.amazon.com/Broadlink-RM4-Universal-Control-Compatible/dp/B07ZSF46BX
