Thermostat- you'll probably be OK without that one bolt...but it might be worth going at with an easy out and drill bit combo.
Water pump- I found the same issue you did with the steering rack. My plan was to drop the rack and hang it out of the way without disconnecting it electrically. However, i was unable to remove the steering column easily....I left the rack attached with the exception of the passenger side control arms. That took a few larger sockets and wrenches, but it was easy enough to do the job.
I wouldn't recommend trying to do the water pump without dropping at least the passenger side control arms. It's hella tight in there.
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