Dave,
If I understand you correctly, you should be able to operate the toggle with the safety on, if the Luger has a relieved sear bar.
The "click" is more problematic. I suggest that you first thoroughly clean the workings of the gun and especially make sure that the plunger on the sear bar operates freely. Then reassemble and try again. If it is not the plunger it could be that the trigger lever needs some fitting, especially if the side plate is mismatched.
I just re-read your post and noted that there is no dry fire click but now see that the gun fires OK. This makes me think more strongly that it is a sticky sear bar plunger and that the shock of firing makes it work but it sticks when dry firing.
KFS
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