Emotiva or Anthem or Something Else?

I have exactly that system. Mrx 520 to Luxman 507.  Works great.

I almost feel like I need two systems.

Absolutely no, you don’t. You can seamlessly integrate a HT system and solely-functioning 2-channel system in one and change between the two with the push of one button.  All you do is hook the front 2 L/R preamp outs from your Anthem to the  stereo integrated and you’re all done.  Please ask if you need more details, cause this is absolutely doable and easy.

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That sounds interesting. Would you mind giving me more detail on how that could work? Maybe with some specific components of your choosing? I’m getting all new gear except for the speakers so open to suggestions. I do currently have all of the speakers and one thing that needs to be factored in is that I have four self powered sub woofers that would be shared between the two speaker configurations. And would I need a speaker switch box?

More thinking and maybe I understand...

Are you saying I could take the Receiver and wire up all of the speakers to the out puts on the Receiver except for the Front Left and Right. For those channels I would connect from the Preamp Out Front Left and Front Right on the back of the receiver to a completely separate two channel amp. That amp would then power just those two speakers. So the end result would be that I would not be using the Front Left and Right channel amps on the receiver. In that case would I even need an integrated amp for those two speakers? Seems like I could just use a stereo power amp and control the volume from the Receiver.  What might be necessary is for the receiver to have some sort of speaker configuration profile so that I could turn off all of the speakers except for the Front Left and Right Pre-Out as well as the SubWoofers.  The subs would be used for both speaker configurations.  I think the Anthem has something like that.

Seems like I could just use a stereo power amp and control the volume from the Receiver.

NO!!! The only thing worse than an AVR’s amps is its preamp section, and a good preamp is absolutely crucial to getting good sound. That’s why I recommended an integrated stereo amp because then you’re completely replacing the AVR for critical 2-channel listening. What I’d recommend is minimizing your expense on an AVR that has front L/R preouts and maximize $$$ toward a good integrated stereo amp. Here’s the AVR I’d buy because it’ll do everything you need for HT processing and powering your center/surround speakers…

https://www.accessories4less.com/make-a-store/item/yamrxa780bl-rb/yamaha-rx-a780-7.2-ch-x-95-watts-a/v-receiver/1.html

What are your speakers, what amp/pre/AVR do you have now, and what improvements are you looking for and what sound characteristics are most important to you? With this info we can start talking about stereo integrated options that would be worth exploring further. And yes, you have the correct idea that you’d use the front L/R preouts from the AVR into the integrated stereo amp, and if the integrated has a HT bypass function you literally push one button to switch between HT and stereo, and when in stereo the AVR is completely out of the system, which is what you want.  It’s a beautiful thing really, because you literally have the best of both worlds in one system.  I did this for years until I finally got my own dedicated listening room, and it was a great way to go.  Goodonya for putting in the effort to research this option, because it will serve you well!