I'm not saying it is easy. I'm saying the current solution is dumb. It hasn't been improved upon in decades. Using wireless/headphones is very common and the ability to easily connect wireless headphones to an AV receiver should be built in functionality. The guys making these receivers aren't stupid, they just don't realize what a headache it is for EVERY SINGLE PERSON who wants to do it slightly differently than we did 30 years ago.
Certainly building in a relay to a remote, and adding a couple of RCA outputs for headphones, is basically pocket change to the cost of a mid-tier AVR. But, this functionality basically exists nowhere. This is the type of stuff that should and could be dealt with if anyone gave it any thought at all.
This is not straightforward. There are competing systems. Bluetooth for headphones seems on the way out.
The RF is gaining ground, but know there is the Clear system. Some connect with RCA jacks, some with 1/4" stereo phone jacks, some with optical digital and some with Coax digital.
I suspect that with headphones becoming the dominant way to listen to Atmos audio, I suppose an HDMI connection is in the offing or a new optical protocol to support Atmos.
So there is the charging base, which is also the transmitter, so that has to have a source of power.
This all sounds to me like a recipe for cluttered installations. I personally hate headphone listening, and only use them in the course of production work.
If I did want to use Radio Phones and especially the new Kleer, I would have to put the transmitter in the chase, where there is AC and the back of the AVP is easily accessible. The charging base would have to be in the chase.
I really don't see the front panel of an AVR or AVP the best place to put all this connectivity. I am not even certain that the way these wireless headphones are designed they are aesthetically compatible with current AV installations. I do know that any of the current systems would make a mess of all of my systems.
What it will take, is an agreed wireless standard and have headphone radio transmitters built into AVRs and AVPs. If there is no agreed standard and protocol I don't see a solution. Adding transmitters to AVRs and AVPs would come at significant cost, and also raise the problem of avoiding RF interference with other circuits in the unit.
As far as wired connection go, I see nothing wrong with the 1/4" stereo phone jack.