@andycc72 I encourage you to take with a pinch of salt the perspective of one person who has taken a view that there is no audible difference between every DAC. Each to their own.
That is certainly not my experience and if it were true, the DAC market would be a dead duck. The truth is, the digital market is full of clamour for the next converter technology to outdo the last and although features are part of that, sound quality is very much part of the story.
Some people may be comfortable that a cheap DAC is all they'll ever need and may even convince themselves that it will have the same performance as the most expensive DAC on the planet just because they measure similarly, but millions of ears across the world have been convinced to spend more than a few quid on their DAC (mine included) and to suggest it's all a trick of the mind is just frankly tosh.
But don't take mine or anyone else's word for it. Try one out and hear for yourself with an open mind. You may be pleasantly surprised or you may also decide your agree that they all sound the same. But you won't know if you don't try.
Personally, I think your system is going to be revealing enough to hear the benefits of a better DAC, especially with those KEFs.
I don't have any experience with the node2i so can't say how much you'd need to spend to get a notable upgrade and I do agree with a comment earlier that a greater influence on sound quality will probably come from your proposed Lyngdorf purchase (depending on how bad your room acoustics are), but I'd be surprised if the node2i outperforms something like the Chord2Qute. And if it does, then it is certainly very good value.
I think a second hand 2Qute would be a good shout, so you could just sell it at exactly the same price if you didn't like it as they hold that their value incredibly well.
I too have had the same itch during lockdown for spending my hard earned cash on hifi upgrades and if you have the cash, then go for it.
I know it works for me.