Jeff,
HT bypass is not required, it is just a bit more convenient. You can do the same thing using an integrated without HT bypass. You simply use an unused set of inputs, i.e. AUX, tuner, etc. and connect the L&R front pre-outs from the receiver to this unused input on the integrated amp. When you want to play HT, you will need to select this input on the integrated and set the volume control on the integrated to a pre-defined value (like top dead center, 5, etc.) When you calibrate the HT you will need to set the integrated's selector switch to this input, and set the integrated's volume control to this pre-defined value. Then everytime you play HT you will also need to set the volume on the integrated to this pre-defined value.
Once you do it a couple of times it will become second nature.
Don't give up on trying to find an integrated with the HT bypass. However, if you find one you love that doesn't have it, it's still workable.
Enjoy,
TIC