Thanks for settling the matter in regard of my answering the wrong question.
Hopefully, my edited version has provided the answer to the actual question you had been asking.
Your nicely pragmatic solution is a neat way to solve the problem using the bits you already have to hand. Some might regard it as 'a bit of a bodge' but to my mind, its more a case of 'inventive lateral thinking'.
I've tried similar repurposing of these lugs (as I'm pretty sure most eevblog members will also have done) but with rather mixed results, mainly it has to be said, because the lugs I'd used were not as good a quality as yours.
I suspect others have hit the same problem and would have needed to spend time and money to acquire a stock of decent quality lugs to emulate your solution, hence the interest in spending the time and money instead on these 6M binding post kits just for the 4mm banana socket adapter lug nuts.
My post about my experience in purchasing a set of these M6 binding posts had been to provide a "Heads up" for anyone else contemplating this 4mm banana socket adapter exercise over the risk of landing up with M6 fine threaded binding post nuts which don't fit on the SDL 1000X terminal binding posts.
BTW, I fully understand Siglent's decision not to curse these electronic loads with 4mm banana jacks since apart from the complaints about the lack of high current rated binding posts, this could also lead to a higher rate of expensive shorting out accidents with power supplies and battery packs. Far better for Siglent to leave the choice of potentially unsafe connections entirely in the hands of their customers than to be seen to be encouraging such misuse of banana plug ended test leads.
A better solution to arranging a more convenient connection IMHO, would be a pair of 4mm banana jack plugs attached via a couple of 3 or 4 inch 10 gauge flexible lug ended fly leads and use test leads terminated with solderable in line banana sockets. Basically the same connection method you'd use to test wallwarts with co-axial dc plug ended flyleads.