Several years ago I nearly went with this DAC in the link to match my LD MKVII+ but went with the Matrix Mini-i instead because it had dual AD1955 DAC chips for L&R channels. This LD DAC_1 had a single Wolfson WD8740 chip at the time (2012?).
I wished I had paired it with the LD MKVII+ (after hearing it at a friends house) as the WD8740 chip sounded just fine pushing both channels and seemed a better pairing with the warmer HD650s.
I think the link is still live and I know the seller was reliable and ships direct from China (which has it’s good and bad points). They might even still sell on/through eBay. Either way, it’s a great, relatively inexpensive DAC.
You might even be able to negotiate a deal, if they still sell them (and you buy direct).
https://m.shenzhenaudio.com/little-dot-dac-i-dac-1-digital-to-analog-converter-dac.html