Well done scroggs
It sounds well handled and you don't have to justify your actions, nobody with any real flying experience would have questioned it.
As for the R/T, I wouldn't worry, it may not have been textbook, but it was perfectly unambiguous.
We practice things over and over, getting them perfectly right, so that on the day we get them "right enough". Nobody could have been in any doubt hearing that call.
Glad to hear it's only temporary injury to the FO, hopefully he is fully recovered and back flying again soon.
I'm glad you are trying to make a difference while you still have some influence, hopefully it is enough for the powers that be to sit up and take note of what is probably one of the biggest external threats to aviation safety after drones.