Sure I've seen this question before somewhere.
That would be huge task for new applications alone and in my opnion virtually unachievable if existing FAC holders were included.
Setting up the infrastructure would be problem number one, who would do the instruction and who would do the testing if the latter was required.
You can guarantee that if it was left to a government agency to take control of all this, the waiting list would be huge, there would be a drop in applications or the processing of them and someone somewhere would be thinking that they could use this as a means of reducing the number of applicants and firearms.
I have nothing against there being a requirement for some sort of introductory training, infact I think it could be a good idea, but can just see it turning into a farce.
As for existing holders, now that's even more difficult in my opinion.
If the training cost money, which it would, who will want to pay unless it is of some benefit to them, or unless it was compulsory in which case we would see a large amount of firearms being seized due to failure to qualify or more likely, bureaucratic cockups.
What would be nice, living in dreamland, is that once you've held a firearms cert for a certain number of years, you could then apply for such training as you mention, after that training you could then apply to hold a certain number of firearms within a category without all the variation lark.
So you would be granted say 2 rimfires, 2 centrefire rifles up to a certain calibre and so on. As long as you stayed within that remit, you could have what you wanted without having to apply each and every time you wanted to change.
Sorry I've wondered off a bit.
In answer to you question.
Yes and No
