GS wrote:
Of course, there's always the option to go DLL or COMAddin!

I did it about 7 years ago.
I moved all calculation logic to C++
Unfortunately a couple of things must stay in VBA or we simply do not
want client to add anything to VBA.

What I do is more like document facing project . File can be send around
the world.
I can't install anything. All VSTO or DLL requiring registration with
admin right can't be used.