Might be a long shot but I'm not a member of a more appropriate board. Essentially it is this, our church has a board sending signal to the apps that sends an amplified signal to the monitors on stage. I want to be able to connect directly to a monitor channel withe a wire In-Ear monitor such as the Behringer P2. The main issue is that these set ups require a line level signal, but I only have an amplified signal. I play on stage about once or twice a month and will be the only one using In-Ear so I really don't to rewire/reroute or put undue strain on the sound techs. Is there simple way to step the amplified signal down to line level that will allow this to work correctly?

My guess is no. You'll need to split it off before it goes to the amp.

Icing on the cake would be a multi-feed back your way. I'm pretty sure our folks have the ability to control the actual mix of what they hear themselves. Pretty amazing what's possible these days.