[EDIT:]
Managed to get it working – seems it was correctly set-up initially, but for whatever reason, took a few hours before it began working as expected… 
I just followed the BTT guide, as below.
Regardless, many thanks!
[/Edit]
Do you mind sharing a screen-shot of how you set that up – specifically the alternative Caps Lock state?
I’ve worked through the BTT guide, and even though I have set up a “Named Trigger” that is supposed to trigger Caps Lock when I hit the hyper without any other keys, it’s not working as of yet… Maybe a reboot will help, but I’ve too many things open currently to try that.