It would be helpful knowing what "just clicks" really means, is it the starter solenoid clicking when the key is turned ?? If you are at the EWS connector already then you might as well try the bypass but if you suspect the starter anyway then why not take a few things out of the way and get access to test at the starter, maybe even do a quick check for power at the bulkhead connector while trying to crank as well.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)