I looked at the route last week and the only practical way to connect them is just west of the Dargan Bridge. I imagine operations would either see Christchurch-Dundrum (terminating) services or Christchurch-somewhere beyond Dundrum services, which would mean a third platform / track at Dundrum stop would be really useful.
There isn't really a useful space west of the bridge for platforms, so a 'nearby' solution is luckily unlikely. The terrain under the bridge means a continuation along Taney Road would also be unlikely.
Potentially you have Bray-St. Stephen's Green and Fassaroe-Christchurch (or vice versa) with staggered starts at Sandyford and / or Dundrum.
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