YAQIN tube amp for 2-channel listening in 7.1 set-up

[jerzy1953]

I have a complete 2010 Monitor Audio Silver RX 7.1 surround system being driven by DENON AVR-3311 Ci receiver. All speakers are bi-wired to the receiver and their jumpers have been taken off.
I would like to use front MA RX 8 speakers ( 4 ohms ) along with YAQIN MS-34D tube amplifier ( 4 and 6 ohms ) and DENON DP-35F turntable to enhance the 2-channel stereo music listening experience.
My question is: How I can use these speakers for surround AND stereo system without disconnecting their wires constantly in order to listen to one system at a time in the same room?Can I use Denons pre-outs or rather 2 zone pre-outs?

Should I install NILESs DPS-1

(Niles Audio Corporation Switching Systems&categoryID=Switching Systems&catcdID=10&prdcdID=FG00003)

or SAS-1 (Niles Audio Corporation Switching Systems&categoryID=Switching Systems&catcdID=10&prdcdID=FG00230) switch?

Is it at all possible to set up stereo system this way since the MA jumpers have been taken off for the bi-wiring? I would like to avoid wrecking my balanced surround sound system. Can I use DENON AVR-3311Cis 8 ohms inputs with MA RX 8s 4 ohms front speakers?

Please give me your opinion,
Thank you
George Zawadzki