OP, your Node will take care of MQA using the RCA outs. Most room correction software is either built into the preamp/integrated amp or is in a device that sits between your amp and preamp. You could insert a DSP device between a source like your Node and your integrated amp via RCA or s/pdif but you would need inputs of the right type for each source, including HDMI for your Sony.
Replacing the Node with an NAD C-658 will get you Dirac room correction, inputs for most of your devices (except HDMI), and a pair of sub outs for subwoofers.
The C-658 does have a "card" you can purchase that can add 3 HDMI inputs as well as an HDMI output you can insert. This should work for SACD two channel but ask the dealer to confirm before you pull the trigger.