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If it were a single piece of worktop, I would avoid wood like the plague, But the worktop is three 2m lengths of wood - only one of which has the undercut sink & rot in it.
Replacing 1 x 2m length seems acceptable, given that this is only going to be temporary.
Whatever I spend is going to be regretted spend, as I'll be ditching the lot in a couple of years, when we re-do the kitchen entirely.
If you're going the new route, don't have the surround made of wood.
I don't feel the rest of the counters can't be wood (ours are, no problems), but in a wet zone, really?