"While" versus "whilst"

There is a definite tendency today to simply use (he says, voluntarily splitting an infinitive!) "while".

A decent summary of the issue is available here:

http://www.richardhollins.com/blog/grammar-tips-while-or-whilst/

However, I was composing a pretty ordinary sentence the other day, and "whilst" seemed a better fit to me:

He will also oversee Acme Corporation's differentiation strategy in terms of its products and services whilst optimising design and construction costs.

(I was having to deal with another one of those long lists in French: "he does a, b, c, d, e, f...". I don't usually allow more than three items in any such list without adding some kind of conjunction.)

Here is the same sentence with "while":    

He will also oversee Acme Corporation's differentiation strategy in terms of its products and services while optimising design and construction costs.

To me, the "while" sounds like he's doing everything at the same time; imagine him spinning plates.

It's almost like "whilst" has a sense of "as well as" in this example.

Of course, the EMT editor at the client may have simply edited out the "whilst" for the more internationally acceptable "while".

To be continued...