Colorbond fence reinforcement for high wind area!

Only colorbond fences I have seen blow down took the brickwork/blockwork with them meaning
installing posts on top of blocks is asking for trouble.
If you don't mind the extra cost by all means use a gal post and screw the colour post to that after the blocks are laid, but you need to
concrete the gal posts into the ground/foundation first and let the brickie fit to the posts.
Doing this will mean you will see the gal post.
It's only 2 blocks high so the brickie should not complain too much.
Install some reo twist bar Y12 and core fill the blocks approx 2 blocks either side of the post for added strength.

Some will say this is overkill but the fence won't fall down due to overkill.

Another way is concrete a gal plate 50 or 60x8 maybe 400 into the ground and set the blocks around them then core fill same as above.
The plate needs to be above the blocks approx 800 and the colour posts then fix to them with 3 gal/zinc screws

Of course either way, both ideas will need the posts or plates set to suit the fence panels .

I've got some 1500mm high cb fence that has survived circa 140kmh winds on numerous occasions - its just the std framing set into concrete. the good thing about the light framing, is you are better off with that failing than taking what its tied to with it - remarkably strong actually (site is elevated 40m, and 8km to the next hill)

Go the a fence supplier and order the extra long posts. Concrete them in as standard depth and have the bottom rail at whatever height you want the fence to be.
Once it's set pull the bottom rail out so it is not in way of the bricky. Bricks can be laid around the post to hide it.

When you install the panels you will have a heap of pop rivets. Most people chuck them over their shoulder. What you are supposed to do is put one in the overlapped sheet joint at approx middle height.
In high wind areas it's also worth putting a extra tex screw mid rail into the sheet. It stops the rail bowing and letting the sheet come out.
I've never had a post fail but have had sheets blown out under high wind which is why started doing the above and so far touch wood not had any more issues.