It is unlikely you could generate a .rcproject file for iMovie '09 from a newer .imoviemobile file from iMovie '10 and later. Such backward compatibility is probably not present in iMovie.
Convert iMovie project package to iMovie project file.
We found one software available in the database for this conversion.
Apple macOS / Mac OS X software - convert imoviemobile to rcproject on OS X
A proprietary video editor for Mac OS X and iOS
Convert from imoviemobile file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.