Somehow I ended up looking at "vocal doubler" type plugs and found this. I've had success with their stuff before (Event Horizon and a few others) and they do an uncrippled download and then nag you for a licence.
Nothing to lose, right?
So I downloaded the installer and installed the 64 bit .dill version - it's supposed to be Win 10 & 11 and I'm on 7 but it's a .dll, so how would it know? Fired up Reaper and there it was.
So I've applied it to a verse / chorus of the latest tune, Unravelling, to see what it would do. I haven't done anything other than select the "Silky vocal" preset (because that was the only one that seemed to relate to vocals) and while there I saw "Wide snare" so I chucked that on the snare drum as well.
Snippets below, with and without. Thoughts?
(@rayc - given you use Reaper ReaDelay vocal thickener preset a lot you might find this useful. Perhaps worth a download anyway... then we can hear Silky Vocal ray...

Without CMX - current mix:
With CMX on lead vocal and snare: