>Will this be implemented as an FLL? Or will it be a DLL that will be created as an object?

It'll be both an FLL and DLL, but no object.

I'll use the FLL interface to call the DLL functions internally. But, you will be able to use it with DECLARE - DLL function calls. It will just not have optional parameters, quite the same type checking, and less error reporting compared to what's possible in an FLL.

To make it an ActiveX / COM / OLE object is notably harder in C++. Someone could write a C# or even C++ wrapper. It will be released with all C/C++ source code.