Yes. You may combine both in Denon 791.
Some 'Pure Audio' , 'Direct', buttons on AV receiver allow you to play regular CD to original 2.0 when pressed.
Other options in the Reciver will process the same CD signal to 2.1 or 5.1 by choice, Neo 6 ... etc. .
Listen and try these options to meet your demands and taste in CD / phono listening.
IMHO, may be the LR front in Mirage Naosat 5.1 are too small & weak.
If you have some good old stereo speakers, try them in the front and play some pure audio CD.
If you like them than the Mirage fronts, re-setup surround for better sound in HT.