Can I convert a module into an expansion

I did a few times ago convert an expansion into a module. In fact, by editing the buildfile I took the time to merge the module expressions and items into the module buildfile.
It was quite a long process and many errors had to be adressed afterwhat.

Now, I have worked on an expansion, but instead of creating AS an expansion, I made a module !
Can I convert that module into an expansion in as easy way ?

What do you think ?