The genuine police bracket requires no cutting of plastics
and they cost $82 including the four longer bolts required.
The downside is the $50 freight!
I rather like the look of these, as they don't go in through the "air intake". And, as you say, no need to butcher Soichiro Honda's artwork to fit that third type that goes under the mirrors.
And Malcolm just told me we two got the very last 2 available. Anyone else wanting Honda ST1300 Police brackets go on back-order.