Yes, I wondered about whether the UK regulations might affect this, but I note since 2020, UK BMW GS's can option a similar feature. Albeit the indicators are slightly dimmed when operating as running lights.
See examples here:
I'll probably abandon this idea then, in favour of separate running lights, but am stuck on mounting ideas on the Fazer Thou. I don't really want them on the forks, and that doesn't leave many other options?