It is unlikely that the block itself is cracked. Depending on how low the coolant actually was, it IS possible that the cylinder liners are warped, fatigued, and/or cracked. It is also likely that the head is warped heavily or cracked. It doesn't sound like enough damage was done to drop a valve, thankfully. The only way to be sure of any of this is to pull the head and have it examined, then inspect the liners for discoloration, roundness and cracks. If it truly only ran for 15 to 20 seconds with the coolant in the oil, the bearings should be fine. The oil and coolant wouldn't mix that quickly and cause damage. Just get it flushed really well and filled back up with good clean oil.
I would start tearing it apart and getting things checked first. That will tell you if it is worth your time to continue, and only costs you time if you have the tools to do it. Any good automotive machine shop that can check the head for you should be able to check the cylinders as well. You'll likely have to bring it to them, though.
As far as upgrades to the engine/timing system, they are really pretty basic. Use a 2-hole (2-notch) head gasket, copper coat or equivalent gasket sealant, ARP head studs and make sure the head you use (which should already have been checked for flatness) has new valves in it. Make sure the camshafts don't have any fretting/grinding/worn spots. Replace all of the rockers. Replace the glow plugs if they haven't been done or if they are not performing well. There isn't all that much else to do other than cleaning the intake if it is dirty (machine shops can usually do this also, and its worth it to have them do it!). I am a proponent of changing ALL gaskets and seals when rebuilding something, so make sure you do your research and get the ones you think you need. There are tons of posts, as well as youtube videos, etc, of how to do the full timing belt replacement. The head gasket is certainly more work but is self explanatory to a certain extent. Getting the turbo off and back on seems to be the biggest headache. This information is all covered here on the forum but you may have to dig a bit to find it.
As far as a mechanic, unfortunately, I am no help. There are a few here who travel to do things like this but I'll make no mention of them. They will likely chime in if they are interested in helping you out.
_________________ 2006 Limited CRD: Frankenlift II, Fumoto Drain Plug, DIY Stage 1 Tune, In-Tank Lift Pump
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