I had a similar issue.
I wanted to have a home theatre system and a two channel system.
To achieve this I needed to replace both my AV receiver (Cambridge Audio CXR 200) and my integrated amp (Simaudio Moon Neo) because I needed an AV receiver that had separate pre outs for the front left and right speakers (Anthem MRX520) and an integrated amplifier that had a home theatre bypass (Musical Fidelity M6si).
Here's a list of options for amplifiers witha HT bypass.