Joining structural posts

We are looking at raising our Queenslander in Brisbane about 1 metre so it is legal height underneath. We have an existing deck out back that will eventually be replaced with a larger deck but in the short-term we want to keep the existing deck in place.

Is it possible to extend the existing structural posts and if so what is the best way to go about this? Or should I just replace the posts completely with a single length of structural timber? Picture of one of the existing posts below.

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