I have to agree with @JimKnopf that a) it doesn’t make sense to show the picons, if encrypted channels are shown at all, without any indication that they’re not watchable (the lock makes perfect sense here - Estuary’s behaviour is kind of strange IMHO) and that b) it’s even more logical to not have them listed at all, if they’re not watchable in the first place. His instructions look like a neat solution 
That’s a short and simple no. Estuary’s widgets are not as freely customizable as ours and they’re not compatible. We’ve had another request for the exact same widget you’re requesting, so we looked into it.
As I said, with the v18 release we’ll probably be able to offer this widget and many more. Just keep a look out for new widget options in the updates’ changelogs 