One receiver for both ht and 2 channel (diff speakers)

I think you can, just put your 2 channel system on zone 2.  But you'll be better off to have a better amp for your 2 channel system.  

Not sure why you want to use different speakers for your HT system.  Your 2 channel system will likely have better speakers so it is common to use them for the front 2 channels of the HT system.  To do this is simple, you just need to take a pre-out signal for the front 2 speakers from your HT reciever to a seperate input on your 2 channel amp.  You just need to make sure your 2 channel amp has an extra input.

If you have a different reason for doing it your way I apologize for the distraction.

Jerry

I'm not really sure why you want to get this complicated?  It's quite easy to use the same floor standing L and R speakers for both, especially since you are going to be using the same receiver. 

Yeah, try HT with your 2-channel speakers and see how it works.  Also, adding a good stereo integrated amp as @carlsbad2 mentioned above will up your 2-channel performance.  If you’re not willing to incorporate a stereo amp I’d recommend an Anthem AVR.  Best of luck.