Nucleophilicity and basicity of compounds with or without nitrogen inversion

In nitrogen inversion, the lone pair changes its direction continuously.


Does this in any way delocalize the charge density on the nitrogen making it less nucleophilic and less basic than, say, a bridgehead nitrogen?


Consider the specific case of quinuclidine and triethylamine. Which will be more nucleophilic among them and why?


[![enter image description here](https://i.stack.imgur.com/n3UNsm.png)](https://i.stack.imgur.com/n3UNsm.png)


