Trying to find a split column cap

[Lincolnshire Ian]

Hi folks

We have a nasty galvanised pole supporting our porch roof. 

Our plan is to create a brick pillar around the bottom of the pillar and the top half oak cladding. 

I am trying to find the best option to transition between the brickwork and the oak, and at the moment it seems to be a split pillar cap on top of the brick pillar, and then leave a small gap between the cap and the oak to stop the water tracking up. 

The sort of thing in the picture. 

What do you think? 

Will this work, where could I get a split cap, any other ideas etc. 

Thanks