I won't claim to have invented this as I expect people have taped leads together in order to achieve the same thing but here's a solution I use to to get the guitar and iems feed down one cable
Basically the box contains a stereo headphone amp, 2 ambient mics and a pass through for the guitar signal. I can control the level sent from the mixing desk with one pot, the other pot controls the volume of the ambient mics so I hear the audience and other stuff. There's a crude clamping limiter to prevent too loud transients reaching my ears as well.
The stereo sum of this is sent up the double lead where a small box allows the iems to plug in just before the lead goes through the guitar strap and plugs into the guitar. This system is so good I prefer it over any wireless solution
It's about £80 worth of bits, I've often wondered if this could take off as cheap alt to wireless IEM's, with better sound quality and no hassle with batteries
www.2020studios.co.uk
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And of course always carry a spare of any 'unique' cables because no one else will have one.
Good call there though.