I was in the same boat for a few years with Schiit Yggy DAC. I had purchased the original Yggy many years back (2016?) and it took a couple of years before the Unison USB board became available. The Unison USB board was what provided asynchronous transfer and it was a huge difference in sound once I installed it. So it was a huge leap in sound quality.
Yes, I guess there are two drawbacks with your Bluesound Node. The switching power supply (vs a Linear Power Supply) and the transfer not being asynchronous. The Chord DAC you have is really well respected and is not reaching it's potential. If you were to get the kind of upgraded sound I got when I installed the Unison USB board, it will be a huge sound difference.
Just a quick look at the ICON and it too has a switching power supply, so if you were to upgrade at some point to an ICON, you may be able to use the Pardo power supply in the ICON and put the old one back into your Node for resale.