Having perused the website, this role appeals to me a lot, unfortunately there aren't much videos on youtube describing what they do. I intend applying for this role, but would like to know if the role is readily available.
Shouldn't you be talking to the Recruiters to see if the job is easily available? They are up to date, few on here are.
Perusing this; Job Gunner - Unmanned Aerial Systems - Centre for Army Leadership it's Artillery, so if there wasn't an immediate opening you may have to do another job while you wait. Would you be prepared to do that?
That said with two regiments as possible destinations I would imagine you stand a fair chance if you are good enough. But don't quote me, I'm well out of touch now.