I don't see how they would fail to work with a VO if you adapted the concept for either BBC One or ITV. Maybe it's because I grew up on Central who did their CAs
over a fixed-length ident and piece of music. The way I hear it in my head is finishing the CA to hit the five-note motif.
The issue I have is that the ident has so much of a 'story' or 'narrative flow' with so much going on, so many shot changes etc. that it would fight a VO telling you about something totally different - the details of the next show or channel events happening later. There would a dissonance between what you were seeing and what you were hearing.
If you look at the various BBC One, BBC Two, BBC Three or BBC Four idents over the years they've either been continuously neutral, or have had a short bit of action or detail prior to becoming more neutral before the VO starts. They don't try to tell any form of significant story visually.
The SRF stuff looks like it is far more suited to a standalone channel branding sting, or a sting that resolves into a separate menu slate which is then VO-ed? (But in UK terms they are too long for that usage)